Group Abstract Group Abstract

«Groups
Physics
Join
Classical and quantum mechanics, electricity and magnetism, thermodynamics, high-energy and particle physics, condensed matter physics, biophysics.... Astronomy and optics are separate categories.

Discussions List Discussions List

Wolfram Model In cloud notebook not compiling?

QUESTION FROM: John Lasheras | 5 years ago BY: Jan Poeschko
Computer Science , Graphs and Networks , Modeling , Physics , ...
1
REPLIES
8.2K
VIEWS

Weyl-4 term in black hole physics

QUESTION FROM: Akshay Sunil Bhadage | 5 years ago BY: Hans Dolhaine
Mathematics , Physics , Symbolic Computations , Wolfram Language
1
REPLIES
5K
VIEWS

Why does FourierTransform return 0, while it's obviously incorrect?

QUESTION FROM: feature engineer | 5 years ago BY: feature engineer
Calculus , Mathematics , Optics , Physics , Wolfram Language
4
REPLIES
7.4K
VIEWS

Intensity of light in double slit experiment?

QUESTION FROM: Wonseok Lee | 5 years ago BY: Henrik Schachner
Dynamic Interactivity , Graphics and Visualization , Optics , ...
10
REPLIES
6.7K
VIEWS

Obtain each residue with MultiNonlinearModelFit global analysis

QUESTION FROM: Hélène PASQUIER | 5 years ago BY: Hélène PASQUIER
Calculus , Chemistry , Mathematics , Modeling , ...
5
REPLIES
8.8K
VIEWS

Solve a quantum potential well equation?

QUESTION FROM: Reza rho | 5 years ago BY: Reza rho
Equation Solving , Mathematics , Physics , Symbolic Computations , ...
2
REPLIES
7.3K
VIEWS

Solve nonlinear complex numerical differential equations

QUESTION FROM: C. H. | 5 years ago BY: Anonymous User
Equation Solving , Mathematics , Numerical Computation , Physics , ...
14
REPLIES
7.7K
VIEWS

Solve nonlinear numerical differential equations with several variables?

QUESTION FROM: C. H. | 5 years ago BY: C. H.
Calculus , Mathematics , Numerical Computation , Physics , ...
3
REPLIES
4K
VIEWS

[?] Make a project about parallel RLC circuit gain and Q?

QUESTION FROM: Mohammad Hassan Ramezan zadeh | 5 years ago BY: Mohammad Hassan Ramezan zadeh
Dynamic Interactivity , Engineering , Mathematics , Physics , ...
4
REPLIES
7K
VIEWS

Plot the following expression according to the given constants?

QUESTION FROM: Mr Suma | 5 years ago BY: Bill Nelson
Engineering , Graphics and Visualization , Mathematics , Optics , ...
3
REPLIES
6.2K
VIEWS

Create an animate of an elastic collision with Manipulate?

QUESTION FROM: zare maz | 5 years ago BY: Anonymous User
Dynamic Interactivity , Graphics and Visualization , Mathematics , ...
2
REPLIES
4.3K
VIEWS

[?] Perform an approximation with radial basis functions?

QUESTION FROM: Peter a | 5 years ago BY: Michael Kelly
Algebra , Calculus , Discrete Mathematics , Mathematics , Physics , ...
2
REPLIES
13.1K
VIEWS

Expand dot product of spin-operators

QUESTION FROM: Giuseppe M | 5 years ago
Mathematics , Physics , Wolfram Language
0
REPLIES
3K
VIEWS

Generating random numbers from given continuous distribution

QUESTION FROM: elena max | 5 years ago BY: elena max
Mathematics , Physics , Statistics and Probability , Wolfram Language
5
REPLIES
5.2K
VIEWS

Optimizing code that numerically evaluates line integrals on Mesh/Grid

QUESTION FROM: Tharindu W Fernando | 5 years ago BY: Tharindu W Fernando
Graphics and Visualization , High-Performance Computing , ...
4
REPLIES
6.5K
VIEWS

Write a differential equation in Wolfram Language?

QUESTION FROM: Reza rho | 5 years ago BY: Reza rho
Calculus , Mathematics , Physics , Symbolic Computations , ...
2
REPLIES
5.6K
VIEWS

[?] Use seed random method for Empirical Distribution for RandomVariate?

QUESTION FROM: decha promtem | 5 years ago BY: decha promtem
Data Science , Mathematics , Physics , Statistics and Probability , ...
2
REPLIES
5.1K
VIEWS

ErrorBarLogPlots

QUESTION FROM: Elham Jamshidi | 5 years ago BY: Elham Jamshidi
Data Science , Graphics and Visualization , Packages , Physics , ...
9
REPLIES
4.9K
VIEWS

Avoid issue while calculating with units?

QUESTION FROM: Fred Kuttner | 5 years ago BY: Fred Kuttner
Mathematica , Physics , Units , Wolfram Language
3
REPLIES
5.7K
VIEWS

DensityPlot3D working too slowly - How to make it faster?

QUESTION FROM: Sivan Harazi | 5 years ago BY: Sivan Harazi
Graphics and Visualization , Material Sciences , Optics , Physics , ...
3
REPLIES
7.2K
VIEWS

Solve 1D heat equation with a non-initial/boundary condition?

QUESTION FROM: C H | 5 years ago BY: Hans Dolhaine
Equation Solving , Mathematics , Numerical Computation , Physics , ...
3
REPLIES
5.4K
VIEWS

What is the interpretation of the 2 below plots for the given function ?

QUESTION FROM: Rafik zeraoulia | 5 years ago BY: Bill Nelson
Graphics and Visualization , Mathematics , Physics , ...
2
REPLIES
6.1K
VIEWS

Is the neutrino oscillation demonstration correct ?

QUESTION FROM: Marc Escalier | 6 years ago BY: Marc Escalier
Demonstrations , Physics
4
REPLIES
6.2K
VIEWS

Velocity unit after NBodySimulation calculation?

QUESTION FROM: Paulina Jelonek | 6 years ago BY: Paulina Jelonek
Astronomy , Curated Data , Mathematics , Modeling , Physics , Units , ...
3
REPLIES
6.6K
VIEWS

Working with lists - comparing data in lists of unequal length.

QUESTION FROM: David Kirkby | 6 years ago BY: M.A. Ghorbani
Data Science , Engineering , Modeling , Physics , ...
17
REPLIES
15.3K
VIEWS

Problem with numerical solution of a system of PDEs

QUESTION FROM: Daniil Eskoskin | 6 years ago
Equation Solving , Mathematics , Modeling , Numerical Computation , ...
0
REPLIES
3.1K
VIEWS

Find the right angle of a shot (SNOOKER)

QUESTION FROM: Hans Dolhaine | 6 years ago BY: Henrik Schachner
Dynamic Interactivity , Graphics and Visualization , Mathematics , ...
3
REPLIES
6.4K
VIEWS

Find the angle and acceleration of a rocket?

QUESTION FROM: Dawid Kwiatkowski | 6 years ago BY: Anonymous User
Calculus , Mathematics , Physics , Wolfram Language
1
REPLIES
3.1K
VIEWS

Expand a limit form containing sum to series?

QUESTION FROM: Wei Yu | 6 years ago BY: Wei Yu
Calculus , Mathematics , Physics , Wolfram Language
2
REPLIES
4.6K
VIEWS

Solving differential equation with limit boundary condition

QUESTION FROM: Felix Lang | 6 years ago BY: Hans Dolhaine
Mathematica , Mathematics , Physics
1
REPLIES
3.7K
VIEWS

Solve 1D compressible Euler equations with piston and cylinder?

QUESTION FROM: Lucas Beveridge | 6 years ago
Engineering , Equation Solving , Mathematics , Modeling , ...
0
REPLIES
2.9K
VIEWS

Use NDSolve with finite element method for a transient conduction problem?

QUESTION FROM: Kesihain Selvarajoo | 6 years ago BY: Alexander Trounev
Mathematics , Numerical Computation , Physics , Wolfram Language
1
REPLIES
8.3K
VIEWS

Fluorescence lifetime

QUESTION FROM: Hafizah Halip | 6 years ago BY: Bill Nelson
Biological Sciences , Mathematics , Mechanical Engineering , Optics , ...
5
REPLIES
7.4K
VIEWS

Finding local minima of an energy defined by integration in Mathematica

QUESTION FROM: Gabriel Medeiros | 6 years ago BY: Gabriel Medeiros
Mathematica , Optimization , Mathematics , Physics , Wolfram Language
4
REPLIES
7.2K
VIEWS

[?] Integrate a function for different n and m in W|A?

QUESTION FROM: Nicolas Legnazzi | 6 years ago BY: Bill Nelson
Mathematics , Physics , Wolfram|Alpha
1
REPLIES
4.5K
VIEWS

Solve an equation for a deformation?

QUESTION FROM: Gowtham A | 6 years ago BY: Gowtham A
Engineering , Equation Solving , Mathematics , Physics , ...
2
REPLIES
5.9K
VIEWS

Change the order of the eigenvalues and eigenvectors?

QUESTION FROM: Martina Reis | 6 years ago BY: Martina Reis
Algebra , Mathematics , Physics , Wolfram Language
2
REPLIES
4.7K
VIEWS

Mathematica help

QUESTION FROM: Mike Nguyen | 6 years ago BY: Girish Arabale
Mathematics , Physics
1
REPLIES
6.6K
VIEWS

Define my own unit vectors and their dot product?

QUESTION FROM: David Mackay | 6 years ago BY: David Mackay
Geometry , Mathematics , Physics , Wolfram Language
4
REPLIES
9.7K
VIEWS

Possible error in IsotopeData (germanium-76 and selenium-82)?

QUESTION FROM: Igor Kotelnikov | 6 years ago BY: Estevao Teixeira
Curated Data , Data Science , Physics , Wolfram Language
1
REPLIES
5.6K
VIEWS

I want to be able to add in a second object into the same animation frame.

QUESTION FROM: Rudin Kraja | 6 years ago BY: Gianluca Gorni
Computational Linguistics , Mathematica , Physics
1
REPLIES
5.8K
VIEWS

Calculate a recursive formula with three parameters in a matrix exp?

QUESTION FROM: Shaohui Yin | 6 years ago
Equation Solving , Mathematics , Physics , Symbolic Computations , ...
0
REPLIES
3.2K
VIEWS

Convert time vs accelerometer data to plot a random vibration PSD plot?

QUESTION FROM: Delan Chen | 6 years ago BY: Delan Chen
Data Science , Engineering , Graphics and Visualization , ...
9
REPLIES
13K
VIEWS

Radians as Dimensionless Unit?

QUESTION FROM: Eric Hudson | 6 years ago BY: Francisco Rodríguez
Physics , Units , Wolfram Language
10
REPLIES
19.6K
VIEWS

Make the x axis circular?

QUESTION FROM: Luis Felipe Massena Misiec | 6 years ago BY: Luis Felipe Massena Misiec
Graphics and Visualization , Mathematics , Physics , Wolfram Language
4
REPLIES
7.3K
VIEWS

Kindly run below 3 codes and send me the code plus output of the code,

QUESTION FROM: Muhammad Tahir | 6 years ago BY: Muhammad Tahir
Physics
2
REPLIES
4.1K
VIEWS

Train NN for regression of f(x,y;t_i(y))?

QUESTION FROM: Isaac Sarver | 6 years ago BY: Isaac Sarver
Data Science , Machine Learning , Mathematica , Modeling , ...
1
REPLIES
7.9K
VIEWS

Plot the real value of the Fourier component of electric field?

QUESTION FROM: Muhammad Ali | 6 years ago BY: Muhammad Ali
Engineering , Graphics and Visualization , Mathematics , Physics , ...
2
REPLIES
6.3K
VIEWS

[WSS19] Quantum Cellular Automata

QUESTION FROM: Ruhi Shah | 6 years ago BY: Ruhi Shah
Graphics and Visualization , Mathematics , Physics , ...
2
REPLIES
10.7K
VIEWS

Solving the equation dx/dt

QUESTION FROM: Evina Konti | 6 years ago BY: Mariusz Iwaniuk
Engineering , Mathematics , Mechanical Engineering , Physics
1
REPLIES
8.2K
VIEWS

[?] Generate discrete 3d plots for magnetic field lines?

QUESTION FROM: Hong-Yee Chiu | 6 years ago BY: Hong-Yee Chiu
Graphics and Visualization , Mathematics , Physics , Wolfram Language
3
REPLIES
5K
VIEWS

Contract a rank 2 tensor with a rank 1 tensor?

QUESTION FROM: Hollis Williams | 6 years ago BY: Clayton Shonkwiler
Mathematics , Numerical Computation , Physics , ...
2
REPLIES
6.7K
VIEWS

I want to how to...

QUESTION FROM: Ayan Mukhopadhyay | 6 years ago BY: Daniel Lichtblau
Physics
10
REPLIES
6.2K
VIEWS

Compute the spatiotemporal temperature distribution of a liquid droplet?

QUESTION FROM: Zuhaib Nissar | 6 years ago BY: Zuhaib Nissar
Algebra , Calculus , Engineering , Mathematics , Modeling , ...
2
REPLIES
7.1K
VIEWS

Solve issues with Tag RowBox in RowBox using "Quantum Notation" package?

QUESTION FROM: Alessandro Candeloro | 6 years ago
Algebra , Mathematica , Mathematics , Packages , Physics , ...
0
REPLIES
2.8K
VIEWS

Syntax for solving vector field equations?

QUESTION FROM: Rand Dannenberg | 6 years ago BY: Rand Dannenberg
Equation Solving , Mathematics , Physics , Symbolic Computations , ...
4
REPLIES
6.9K
VIEWS

Use Simpson2D rule?

QUESTION FROM: Hong-Yee Chiu | 6 years ago BY: Hong-Yee Chiu
Mathematics , Physics , Wolfram Language
3
REPLIES
4.4K
VIEWS

Plot a free energy landscape?

QUESTION FROM: Lucy Wairimu | 6 years ago BY: Lucy Wairimu
Chemistry , Geographic Information System , Mathematics , Physics , ...
4
REPLIES
7.9K
VIEWS

Join two opposite edges of a 2D rectangular mesh?

QUESTION FROM: Robert Curl | 6 years ago BY: Robert Curl
Calculus , Equation Solving , Geometry , Graphics and Visualization , ...
2
REPLIES
5.3K
VIEWS

Get Feynman diagram for two point function in Phi4 Theory?

QUESTION FROM: Bunny Roy | 6 years ago BY: Bunny Roy
Graphs and Networks , Mathematics , Packages , Physics , ...
2
REPLIES
5.8K
VIEWS

Proper syntax for function precision (MMA 12)?

QUESTION FROM: Mor Bo | 6 years ago
Equation Solving , Mathematica , Mathematics , ...
0
REPLIES
5K
VIEWS

Specify meshes and boundaries in NDSolveValue?

QUESTION FROM: Robert Curl | 6 years ago BY: Robert Curl
Equation Solving , Mathematics , Numerical Computation , Physics , ...
2
REPLIES
5.3K
VIEWS

Include special (reserved) symbols in variable names?

QUESTION FROM: Michael W. | 6 years ago BY: Michael W.
Equation Solving , Mathematics , Packages , Physics , ...
2
REPLIES
8.8K
VIEWS

Calculate the magnetic dipole due to a current circular loop?

QUESTION FROM: Ryan Schmidt | 6 years ago BY: Bill Nelson
Calculus , Graphics and Visualization , Mathematics , Physics , ...
1
REPLIES
4K
VIEWS

Solve 2 coupled 2nd ODEs and plot them with ParametricPlot?

QUESTION FROM: Soumen Basak | 6 years ago BY: Soumen Basak
Calculus , Computational Systems , Equation Solving , ...
14
REPLIES
14.2K
VIEWS

Compute sums containing Clebsch Gordan coefficients?

QUESTION FROM: Robert Poenaru | 6 years ago BY: Sjoerd Smit
Mathematics , Numerical Computation , Physics , Wolfram Language
1
REPLIES
7.1K
VIEWS

Use FindFit to get the rate constants for a chemical reaction?

QUESTION FROM: Troy Wahl | 6 years ago BY: Sjoerd Smit
Chemistry , Mathematics , Modeling , Physics , Wolfram Language
3
REPLIES
8.9K
VIEWS

Finding the first integral of a differential equation?

QUESTION FROM: Syed Naqvi | 6 years ago
Astronomy , Physics
0
REPLIES
3.9K
VIEWS

Finding the tangents of the function in each mesh

QUESTION FROM: Alper Ozel | 6 years ago
Calculus , Graphics and Visualization , Mathematics , Physics , ...
0
REPLIES
2.3K
VIEWS

Problem with a simple 2D RC network

QUESTION FROM: Andras Gilicz | 6 years ago BY: Andras Gilicz
Engineering , Modeling , Physics , SystemModeler
6
REPLIES
9.6K
VIEWS

Fix graphics from Demo "Isotope Browser" (no graphics output)

QUESTION FROM: David Wood | 6 years ago BY: David Wood
Chemistry , Demonstrations , Physics , Wolfram CDF Player , ...
2
REPLIES
8.6K
VIEWS

Solve a porous media problem (The Henry problem)?

QUESTION FROM: Antonio Soto | 6 years ago
Calculus , Equation Solving , Graphics and Visualization , ...
0
REPLIES
2.6K
VIEWS

Mathematica kernel crashing after repeated use of NMinimize

QUESTION FROM: Helena Kolesova | 6 years ago BY: Shenghui Yang
Computer Science , Data Science , Mathematics , Physics
12
REPLIES
9.8K
VIEWS

Model a wave equation forced oscillation, A(t)?

QUESTION FROM: Anonymous User | 6 years ago BY: Anonymous User
Equation Solving , Mathematics , Physics , Wolfram Language
2
REPLIES
2.7K
VIEWS

Avoid a syntax error while calculating jet velocities?

QUESTION FROM: Dan Rivera | 6 years ago BY: Daniel Lichtblau
Mathematics , Physics , Wolfram Language
3
REPLIES
5.9K
VIEWS

Solve numerically a diffusion equation with fully reflecting wall?

QUESTION FROM: Erez A | 6 years ago
Equation Solving , Mathematics , Numerical Computation , Packages , ...
0
REPLIES
2.9K
VIEWS

Integration execution is very slow.

QUESTION FROM: Mustafa Ibrahim | 6 years ago BY: Daniel Lichtblau
Mathematics , Physics
1
REPLIES
4.3K
VIEWS

Count the number of orbits from this Orbit Data?

QUESTION FROM: T P | 6 years ago
Graphics and Visualization , Mathematics , Physics , ...
0
REPLIES
3.9K
VIEWS

Import a 3D head model and interact with it with an animated 2D graph?

QUESTION FROM: alie rainh | 6 years ago BY: Rohit Namjoshi
Curated Data , Dynamic Interactivity , Graphics and Visualization , ...
2
REPLIES
5.3K
VIEWS

Simplify my integrand to make the function Integrate[] work?

QUESTION FROM: Sida Liu | 6 years ago BY: Sida Liu
Calculus , Equation Solving , Mathematics , Physics , Wolfram Language
2
REPLIES
6.8K
VIEWS

Who understands the malfunction of the attached simulation?

QUESTION FROM: Ulrich Mutze | 6 years ago BY: Ulrich Mutze
Demonstrations , Mathematica , Modeling , Physics
8
REPLIES
11.9K
VIEWS

Lagrangian for rolling disk inside a ring

QUESTION FROM: Ravi Shankar Gautam | 6 years ago BY: Ravi Shankar Gautam
Demonstrations , Mathematics , Modeling , Physics , Wolfram Language
4
REPLIES
9.3K
VIEWS

List all build-in physical constants in Mathematica 11.3?

QUESTION FROM: Sascha Tayefeh | 6 years ago BY: Sascha Tayefeh
Curated Data , Mathematica , Physics , Wolfram Language
10
REPLIES
17.2K
VIEWS

Modeling jump conditions in interphase mass transfer

QUESTION FROM: Tim Laska | 6 years ago BY: Anonymous User
Staff Picks , Calculus , Chemical Engineering , Chemistry , ...
19
REPLIES
38.8K
VIEWS

Heisenberg uncertainty for the harmonic oscillator?

QUESTION FROM: Ana Monea | 6 years ago BY: Hans Dolhaine
Calculus , Mathematics , Physics , Wolfram Language
2
REPLIES
5.7K
VIEWS

Animate these 2D plots?

QUESTION FROM: Ricardo Waste | 6 years ago BY: Ricardo Waste
Dynamic Interactivity , Graphics and Visualization , Mathematics , ...
8
REPLIES
5.1K
VIEWS

[?] ParametricPlot results of a diff eqn that are interpolating functions?

QUESTION FROM: Ertan Salik | 6 years ago BY: Mariusz Iwaniuk
Engineering , Equation Solving , Mathematica , Mathematics , Physics
3
REPLIES
6.3K
VIEWS

NDSolve for a heat differential equation with periodic boundary conditions?

QUESTION FROM: Markus Schmidt | 6 years ago BY: Henrik Schachner
Calculus , Engineering , Equation Solving , Mathematics , ...
6
REPLIES
13.1K
VIEWS

[?] Why NDSolve give a run-away solution for a hamiltonian system?

QUESTION FROM: Meir Lewkowicz | 7 years ago BY: Meir Lewkowicz
Equation Solving , Mathematics , Numerical Computation , Physics , ...
7
REPLIES
6.1K
VIEWS

Solve equations for Damped Precession of Magnetic Moment?

QUESTION FROM: David Sanderson | 7 years ago BY: Rohit Namjoshi
Equation Solving , Mathematics , Physics , Wolfram Language
1
REPLIES
3.8K
VIEWS

Perform a derivation with Dirac symbols?

QUESTION FROM: Xiaosong Zhu | 7 years ago
Mathematica , Mathematics , Optics , Physics , ...
0
REPLIES
3.6K
VIEWS

Define functions for variables with units?

QUESTION FROM: Orest Gogosha | 7 years ago BY: Ian Williams
Mathematics , Physics , Units , Wolfram Language
15
REPLIES
17K
VIEWS

Solve the Nonlinear Schroedinger Equation with NDSolve?

QUESTION FROM: Markus Schmidt | 7 years ago BY: Markus Schmidt
Equation Solving , Mathematica , Modeling , Numerical Computation , ...
16
REPLIES
18.9K
VIEWS

Fit the data with Bessel functions using FindFit?

QUESTION FROM: Qiang Li | 7 years ago BY: EDITORIAL BOARD
Optimization , Mathematics , Physics , Wolfram Language
1
REPLIES
5.1K
VIEWS

Add errorbars to a ListLogLogPlot?

QUESTION FROM: Pouria Samieadel | 7 years ago BY: Hans Dolhaine
Graphics and Visualization , Mathematics , Physics , Wolfram Language
1
REPLIES
3.8K
VIEWS

Why a norm preserving stochastic dynamics does not preserve the norm?

QUESTION FROM: Mads Bahrami | 7 years ago
Calculus , Equation Solving , Mathematics , Modeling , ...
0
REPLIES
2.6K
VIEWS

Perform an optical spectra (IR absorption) deconvolution?

QUESTION FROM: Michael Reznikov | 7 years ago BY: Michael Reznikov
Mathematics , Optics , Physics , Wolfram Language
2
REPLIES
8.3K
VIEWS

Simulate the motion of the Earth around the Sun based on Kepler's Law?

QUESTION FROM: Senlau Minto | 7 years ago BY: Senlau Minto
Astronomy , Equation Solving , Mathematics , Modeling , Physics , ...
13
REPLIES
14.6K
VIEWS

Calculate the following Riemann tensor?

QUESTION FROM: Firat Domrul | 7 years ago
Calculus , Mathematics , Physics , Wolfram Language
0
REPLIES
2.5K
VIEWS

Plot the following dipole function with GradientFieldPlot?

QUESTION FROM: Waqar ahmed | 7 years ago BY: Marco Thiel
Graphics and Visualization , Mathematics , Packages , Physics , ...
1
REPLIES
5.9K
VIEWS
2
3
4
5
6

Group Count Group Count

1355 Discussions

Group Branding Group Branding

New Discussion New Discussion

ACTIVE MEMBERS ACTIVE MEMBERS

ACTIVE MEMBERS
dara
Dara Shayda
20 days ago
brunot
Bruno Tenorio
22 hours ago
myrtoter05
Myrto Terpsiadou
1 day ago
jrs2277
John Staunton
1 day ago
ankitn
Ankit Naik
1 day ago
mohammadb
Mohammad Bahrami
8 days ago
akram2007omar
Akram Masoud
8 days ago

RELATED GROUPS RELATED GROUPS

RELATED GROUPS
Wolfram Language 11K discussions 2K subscriptions
Graphics and Visualization 4K discussions 1K subscriptions
Mathematics 6K discussions 4K subscriptions
Computer Science 644 discussions 2K subscriptions
Control Systems 194 discussions 1K subscriptions
Staff Picks 1K discussions 808 subscriptions
Graphs and Networks 629 discussions 975 subscriptions