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| In[12]:= Clear[lukEq] lukEq[n_Integer] := FindInstance[a^2 + b^2 + c^2 == n && a > b > c, {a, b, c}, Integers] /; Positive[n] In[14]:= lukEq[17] Out[14]= {{a -> 4, b -> 1, c -> 0}} In[15]:= lukEq[2016] ... |
| As it stands, it is greyed out and says > Result: (no solutions exist) that's because you typed 5x without white space inbetween 5 and x and also because considering it as linear equation system it is not regular In[2]:=... |
| Three months in the laboratory can save you three minutes in the library ... give [Quantum Mathematica][1] a try ... [1]: http://library.wolfram.com/infocenter/MathSource/7622/ |
| Just for the logs: Bought back in 1991 a [Macintosh LC][1] just because it could run Mathematica 1.1. The package (Mathematica and the Mac) was very expensive (twice the monthly salary), but had the option to upgrade without extra costs to... |
| > Most particularly there was a link kindly given by user, I can reproduce the links, of course - iff they will not going to be deleted again. I would appreciate to get a mail from the canceller about a whole thread or an answer to a thread -... |
| A good starting point is [On Continued Gravitational Contraction][1] by J. R. Oppenheimer and H. Snyder. If I remember it correctly that is the nice paper where light cones fall graceful along the geodetic lines of the metric of the black hole into... |
| In[2]:= FileExistsQ["C:\\windows\\system32\\netstat.exe"] Out[2]= True In[3]:= FileExistsQ[FileNameJoin[{"C:", "windows", "system32", "netstat.exe"}]] Out[3]= True |
| As it appears today ![enter image description here][1] it is partially mistaken by WolframAlpha: In[1]:= Remove[fI, f1, f3, a] fI[L_, l_, u_, \[Alpha]_, \[Nu]_] := ((L + l) Cos[\[Alpha]]) l (((L + l)... |
| See also [Noncommutative geometry and the spectral model of space-time][1] by [Alain Connes][2] where he says (p. 183) > The traditional notions of geometry all have natural analogues in the > spectral framework. We refer to [9] for more... |
| This square is caused by so called *spiders* in the meshing. Spiders are considered in general as bad because the quality of the mesh determines the quality of the solution and a spider usually contains a lot of bad quality mesh elements. The mesh... |