User Portlet User Portlet

Discussions
There is no x3 in your system. That may be an error or it may be confusing Solve. You can also try using Reduce instead of Solve. That will use different methods. Either Solve or Reduce may work better when solving n equations for n...
I paste all the code into a fresh notebook in version 13. Thank you for all that code. That will be essential to try to understand what problems you are having. I am guessing that starting with "An Example" might be your added code. I try to...
If you do not put a space between L and V and between V and t then Mathematica thinks that you have a new variable named LVt f[θ_]:=w(Log[θ]/Log[2])^2+2 L V t^(Log[θ]/Log[2])/(2-p) (*or*) f[θ_]:=w(Logθ]/Log[2])^2+2...
Try Plot[Sin[x] + Sin[x + Pi], {x, 0,2 Pi},WorkingPrecision->64] or FullSimplify[Sin[x] + Sin[x + Pi],0
Use Select to extract each category of points and then overlay plots of the two categories using Show. You can do that with any number of properties, selections and colors. yourlist={{-1,3},{2,4},{-2,2},{3,1}}; Show[ ...
Try k1f=0.5;k1r=0.2;k2f=0.5;k2r=(k1r/k1f)*k2f;k3f=1.5;k3r=10^-3; S=1.25;T=S;P=0.5; R1f:=k1f*S*T;R1r:=k1r*XL[t]; R2f:=k2f*S*T*XL[t];R2r:=k2r*(XL[t])^2; R3f:=k1f*S*T;R3r:=k1r*XD[t]; R4f:=k2f*S*T*XD[t];R4r:=k2r*(XD[t])^2;...
This LogicalExpand[ Reduce[ {{a,b,c,d},{e,f,g,h},{i,j,k,l},{m,n,o,p}}.{a0+a3,a1-I a2,a1+I a2,a0-a3}== {a0,a1,a2,a3}, {a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p} ]] quickly gives you five different solutions. ...
Your time varies from 0 to 50. You use recursion to evaluate that at every 0.01 time step. That means you may use up to 5000 recursions to calculate each time step. Usually people don't do more than 1000 recursions unless something has gone wrong in...
When you put your code in two cells did you first click to put the cursor in the first cell and press and then click to put the cursor in the second cell and then press ? Doing those steps in that order will instruct Mathematica to evaluate...
It appears that the two algorithms may have chosen a different branch of complex log. Table[x=RandomReal[{-10,10}]; N[-Log[(x^2-2x+2)Sqrt[x^4-2x^3+3x^2+2x+1]+x^4-3x^3+5x^2-2x]- ...