Theorem 3p5e8

Description: 3 + 5 = 8. (Contributed by SN, 24-Aug-2026)

	Ref	Expression
Assertion	3p5e8	|- ( 3 + 5 ) = 8

Proof

Step	Hyp	Ref	Expression
1		3cn	|- 3 e. CC
2		2cn	|- 2 e. CC
3	1 2 1	addassi	|- ( ( 3 + 2 ) + 3 ) = ( 3 + ( 2 + 3 ) )
4		3p2e5	|- ( 3 + 2 ) = 5
5	4	oveq1i	|- ( ( 3 + 2 ) + 3 ) = ( 5 + 3 )
6		5p3e8	|- ( 5 + 3 ) = 8
7	5 6	eqtri	|- ( ( 3 + 2 ) + 3 ) = 8
8		2p3e5	|- ( 2 + 3 ) = 5
9	8	oveq2i	|- ( 3 + ( 2 + 3 ) ) = ( 3 + 5 )
10	3 7 9	3eqtr3ri	|- ( 3 + 5 ) = 8