Theorem 3odd

Description: 3 is an odd number. (Contributed by AV, 20-Jul-2020)

	Ref	Expression
Assertion	3odd	|- 3 e. Odd

Proof

Step	Hyp	Ref	Expression
1		2evenALTV	|- 2 e. Even
2		df-3	|- 3 = ( 2 + 1 )
3		evenp1odd	|- ( 2 e. Even -> ( 2 + 1 ) e. Odd )
4	2 3	eqeltrid	|- ( 2 e. Even -> 3 e. Odd )
5	1 4	ax-mp	|- 3 e. Odd