xiamx
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### Questions (12)

 5 Determinant of a linear transformation defining matrix transpose 4 Prove $3^n = \sum_{0 \leq i \leq j \leq n}$ $n \choose i$ $i \choose j$ 3 Show $(W_1 + W_2 )^\perp = W_1^\perp \cap W_2^\perp$ and $W_1^\perp + W_2^\perp ⊆ (W_1 \cap W_2 )^\perp$ 2 How to solve $\int\tan^3(x)\,dx$? 1 How to integrate the volume of a solid torus (donut-shaped solid)?

### Reputation (294)

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 3 Show that Fermat's Little Theorem doesn't hold if p is not prime … 2 Find a matrix that diagonalizes 1 How to solve recurrence equation $f(n) = f(n-5) + f(n-10)$?

### Tags (13)

 3 modular-arithmetic × 2 1 recurrence-relations × 3 3 number-theory 0 combinatorics × 3 3 discrete-mathematics 0 inner-product-space × 2 2 linear-algebra × 3 0 integration × 2 2 matrices × 2 0 complex-numbers

### Accounts (10)

 Stack Overflow 998 rep 11121 Mathematics 294 rep 215 Super User 255 rep 1213 Server Fault 198 rep 118 Computer Science 181 rep 5