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6h
comment version 5 & OS X 10.9
I can run Mathematica 5.2 on an Intel Xeon Mac with OS X 10.6.8, but even if you do manage to run it on 10.9 there will be real usability issues. See e.g. this link.
1d
comment Can I define an axiomatic (Boolean algebra) system and prove theorems using Mathematica?
Also, you could do something like this: Simplify[Equivalent[Not[Or[a, b]], And[Not[a], Not[b]]]].
2d
comment Buying a new computer (specifically for Mathematica)
GPU may be important especially if you plan to use CUDA or OpenCL. But it really is a very broad question which I don't believe has a unique answer.
2d
comment How to check if Integrate solved the integral?
Why not just check Head[r]===Integrate?
2d
comment Reduce function response to a single number
See this recent answer by Mark McClure. It gives some relevant tricks you could use.
Dec
18
comment Animate skips frames and hard to control speed.
Yes, the truth is that for one-parameter list of images I usually would suggest pre-computing all images and using ListAnimate, but you already ruled that out in the question. The reason I prefer this is that you will often want to display the animation more than once anyway, and then it would be increasingly inefficient to re-do the necessary computations every time, the more often you intend to display them.
Dec
17
comment Using If statement for more than two cases
In the Help browser, look up If and follow the links under "See Also".
Dec
17
reviewed Close Derivative of Vectoral NDSolve Interpolated Function / Rule Solutions,/., and Vector NDSolve
Dec
17
reviewed Close How can I make an animation with data points imported from txt file using ListAnimate/ListPointPlot3D?
Dec
17
answered Animate skips frames and hard to control speed.
Dec
17
revised Computing with matrix differential operators
Modified to deal with sums that aren
Dec
17
comment Computing with matrix differential operators
Ah yes, that's because Plus inside Thread is not held unevaluated when its arguments have values that are known at the time of evaluation. To make it works for such cases it's probably best to avoid Plus - I'll edit the answer to deal with the example you gave.
Dec
16
answered Computing with matrix differential operators
Dec
16
reviewed Close How to calculate math expectation
Dec
16
reviewed Close What does this Java error mean? Why is it raised?
Dec
16
reviewed Close Function that adds up every element in an array
Dec
16
reviewed Close how to create a BACK button
Dec
16
reviewed Close How to find a function result from expectations functions
Dec
15
revised Fullsimplify does not simplify Abs'[1.-a]
Include delta function
Dec
15
answered Fullsimplify does not simplify Abs'[1.-a]