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13h
comment Can Mathematica Handle Open Intervals? Interval complements?
I used Mathematica v.9 (or v. 8). I must have drawn everything "by hand". If I were to do it with v.10, I would use NumberLinePlot[{{-\[Infinity] < x < -2, -1 < x <= 1, 4 < x <= Pi^2}}, x] and so forth.
1d
comment Find intersecting rectangles groups
I assume that means that the empty region is indeed a region.
1d
comment TransformedRegion, RegionPlot broken in 10.0.2.0?
You must be Jinxed.
Jan
24
revised Animate point go round a triangle
complete rewrite
Jan
24
revised Animate point go round a triangle
added 326 characters in body
Jan
24
answered Animate point go round a triangle
Jan
22
revised Real Numbers in the Wolfram Language
rational numbers and fractions
Jan
20
awarded  Yearling
Jan
17
comment How to combine multiple rules?
Why not simply use Join?
Jan
13
comment Real Numbers in the Wolfram Language
The folks from Wolfram Research may be able to answer whether MMA is 754 compliant or not. As regards your final question, it seems that no machine implementation will be able to handle all real numbers, so the problem boils down to what name(s) will be used to designate some subset of the reals that might correspond to finite decimals. Perhaps there ought to simply be some clearer way of distinguishing the form of a number (the data type) from the number domain it is presumably a member of. In principle, I would think it reasonable to reserve Real and Rational for domains, not data types. .
Jan
9
revised How to create a combined bar plot with time format?
added 1559 characters in body
Jan
6
comment Real Numbers in the Wolfram Language
Yes. Good point. Inheritance would seem to allow for embedded classes.
Jan
6
comment Real Numbers in the Wolfram Language
@OleksandrR I would certainly welcome your contribution to the discussion base on your points in chat. I realize that this discussion will not lead Wolfram to change or add functions, but I find it enlightening nonetheless.
Jan
6
comment Real Numbers in the Wolfram Language
Michael E2, Unfortunately I have not been able to log in to the chat room. I even tried changing my password, to no avail.
Jan
6
comment How would I use sliders to manipulate the slope and intercept of a plane in a graphics 3d box while the cdf was running
You might start by drawing a single plane with Plot3D. From there you can identify, in your function, the parameters that you would like to vary. Each can then be associated with a slider.
Jan
6
comment Real Numbers in the Wolfram Language
Michael E2, I'm intrigued to hear (but have no reason to doubt) that mathematicians have several ways of looking at such basic objects as integers. My admittedly limited understanding was that such foundational issues had been resolved and agreed upon once and for all.
Jan
5
comment Real Numbers in the Wolfram Language
Daniel, Nice point, which had not occurred to me. Some readers may need a fuller explanation of the distinction between RealQ and TrueQ[Element[x,Reals]]. Would you expand your comment and submit it as an answer?
Jan
5
comment Table and memory efficiency
Bracket missing in Table[Table[i*j,{i,1,10},{j,1,10}]
Jan
4
comment Real Numbers in the Wolfram Language
Nice! I interpret your "distinct systems" to refer to disjoint classes. No number can be both an Integer and a Real data type. This flatly contradicts the mathematician's view of number classes. BTW, I was unfamiliar with $Machine epsilon. It seems to be the smallest difference between two numbers. Reminds me of the following question I have posed to middle school students to provoke a discussion of continuity: "What's the smallest number that's greater than zero?" Lovely disagreements ensue. Apparently, computers can answer that question but mathematicians cannot.
Jan
4
revised Real Numbers in the Wolfram Language
added 466 characters in body