Theorem 1m1e0

Description: One minus one equals zero. (Contributed by David A. Wheeler, 7-Jul-2016)

	Ref	Expression
Assertion	1m1e0	$$⊢1-1=0$$

Proof

Step	Hyp	Ref	Expression
1		ax-1cn	$$⊢1\in ℂ$$
2	1	subidi	$$⊢1-1=0$$