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For questions about mathematical proofs in an educational context.

2
votes
Some combinatorics: For example the identity $\binom{n}{r} = \binom{n-1 }{r} + \binom{n-1}{r-1}$ can be proven using the formula involving factorials. It can also be proved using combinatorial interpr …
answered Apr 10 '14 by P Vanchinathan
3
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My experience in Linear Algebra: while trying to explain how the co-ordinates/matrix change for a different basis I started with a 3d-rotation matrix for a basis consisting of a vector in its axis a …
answered Apr 11 '14 by P Vanchinathan