Theorem ssbr

Description: Implication from a subclass relationship of binary relations. (Contributed by Peter Mazsa, 11-Nov-2019)

	Ref	Expression
Assertion	ssbr	$$⊢A\subseteq B\to \left(CAD\to CBD\right)$$

Proof

Step	Hyp	Ref	Expression
1		id	$$⊢A\subseteq B\to A\subseteq B$$
2	1	ssbrd	$$⊢A\subseteq B\to \left(CAD\to CBD\right)$$