Theorem ltaddspos2d

Description: Addition of a positive number increases the sum. (Contributed by Scott Fenton, 15-Apr-2025)

	Ref	Expression
Hypotheses	ltaddspos.1	|- ( ph -> A e. No )
	ltaddspos.2	|- ( ph -> B e. No )
Assertion	ltaddspos2d	|- ( ph -> ( 0s B

Proof

Step	Hyp	Ref	Expression
1		ltaddspos.1	|- ( ph -> A e. No )
2		ltaddspos.2	|- ( ph -> B e. No )
3		0no	|- 0s e. No
4	3	a1i	|- ( ph -> 0s e. No )
5	4 1 2	ltadds1d	|- ( ph -> ( 0s ( 0s +s B )
6		addslid	|- ( B e. No -> ( 0s +s B ) = B )
7	2 6	syl	|- ( ph -> ( 0s +s B ) = B )
8	7	breq1d	|- ( ph -> ( ( 0s +s B ) B
9	5 8	bitrd	|- ( ph -> ( 0s B