Question Number 55942 by Tawa1 last updated on 06/Mar/19
$$\mathrm{Prove}\:\mathrm{that}:\:\:\:\:\:\frac{\mathrm{1}}{\mid\boldsymbol{\mathrm{A}}\mid}\:\:=\:\:\boldsymbol{\mathrm{A}}^{\mathrm{1}} \\ $$
Commented by 121194 last updated on 06/Mar/19
$$\mathrm{what}\:\mathrm{A}? \\ $$