Brian Fitzpatrick

 72 What's your favorite proof accessible to a general audience? 49 How to find the determinant of this matrix? 40 Why is $\cos (90)=-0.4$ in WebGL? 27 Express the following invertible matrix A as a product of elementary matrices 24 How can I prove that a square matrix is invertible if it satisfies this polynomial equation?

### Reputation (22,942)

 +10 Showing that the square root is monotone +20 Express the following invertible matrix A as a product of elementary matrices +10 Left and Right inverses of linear operators +10 How to find a basis for 2x2 matrix

### Questions (16)

 18 Irreducibility of Polynomials in $k[x,y]$ 7 Proving Two Complexes are Not Quasi-Isomorphic 6 $2$-Morphisms in the Fundamental $2$-Groupoid 6 Mayer-Vietoris Type Sequence For Pushouts 6 Inverse Functions and $u$-Substitution

### Tags (212)

 1k linear-algebra × 548 105 vector-spaces × 81 329 matrices × 138 97 calculus × 42 126 abstract-algebra × 42 85 category-theory × 25 116 eigenvalues-eigenvectors × 45 72 real-analysis × 30 110 determinant × 19 63 linear-transformations × 45