PutnamSuperchallengeIntegrals I: Feynman's Trick ShareIntegrals I: Feynman's Trick · Superchallenge problemHow many invertible 2×22\times22×2 matrices are there over the field F2\mathbb{F}_{2}F2 (that is, ∣GL2(F2)∣|GL_2(\mathbb{F}_{2})|∣GL2(F2)∣)?Check Show answer Walk through it step by step Practice more like this Review this concept