2011/08/24

[34] [The unique existence of the mth root/m乗根の存在の一意性] ∀m≧2∈N. ∀a>0∈R. ∃!b>0∈R. b^m = a.

https://www.evernote.com/shard/s29/sh/06250865-dca2-4db9-9c0b-db776543944c/f3dc2631a8ae7098df443239d0f3e8eb