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### Questions (29)

 50 Eigenvectors of real symmetric matrices are orthogonal 13 A good book for learning mathematical trickery 7 Fun calculus problem I can't seem to solve 6 Algebraic proof that collection of all subsets of a set (power set) of $N$ elements has $2^N$ elements [duplicate] 6 Infinite series expansion of $\sin (x)$

### Reputation (867)

 +30 Eigenvectors of real symmetric matrices are orthogonal +5 Why generalize the derivative for multivariable functions? +5 Probability, conditional on a zero probability event +5 Is there an intuitive interpretation of $ABA^T$?

 5 Calculate distance in 3D space 3 Improper integral of exponential function times the integer part of $x$ 2 Are these two matrix products equivalent? 2 how seconds per year does the average worker work? 1 $\vec{a} \times \vec{b} = \vec{c} \times \vec{d}$ . what can you say about the direction of $\vec{b} \times \vec{c}$?

### Tags (49)

 5 3d 2 matrix-equations × 2 3 calculus × 2 2 finance 3 integration × 2 2 arithmetic 3 gre-exam 1 linear-algebra × 10 3 improper-integrals 1 multivariable-calculus × 2

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