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Jan
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comment Why $\sqrt{-1 \times {-1}} \neq \sqrt{-1}^2$?
@JohannesHahn: What you describe is what I'm calling the domain of the identity and I'm not making that terminology up myself. I've seen it used in several texts.
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revised How many ways are there to define sine and cosine?
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Jul
22
comment Penrose Tile generator
Being able to fill a rectangular region is different from creating a tileable rectangle (a rectangle for which opposite edges can be glued together to continue the pattern seamlessly).
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20
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Jul
15
comment How to find shortest distance between two skew lines in 3D?
If $D_1=D_2$, the lines aren't skew.
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revised Area of a triangle from some of its parts
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