suppssfifsupp

Description: If the support of a function is a subset of a finite set, the function is finitely supported. (Contributed by AV, 15-Jul-2019)

		Ref	Expression
	Assertion	suppssfifsupp	$⊢ ((G \in V \land Fun G \land Z \in W) \land (F \in Fin \land G supp Z \subseteq F)) \to {finSupp}_{Z} (G)$

Step	Hyp	Ref	Expression
1		ssfi	$⊢ (F \in Fin \land G supp Z \subseteq F) \to G supp Z \in Fin$
2	1	adantl	$⊢ ((G \in V \land Fun G \land Z \in W) \land (F \in Fin \land G supp Z \subseteq F)) \to G supp Z \in Fin$
3		3ancoma	$⊢ (G \in V \land Fun G \land Z \in W) \leftrightarrow (Fun G \land G \in V \land Z \in W)$
4	3	birani	$⊢ ((G \in V \land Fun G \land Z \in W) \land (F \in Fin \land G supp Z \subseteq F)) \to (Fun G \land G \in V \land Z \in W)$
5		funisfsupp	$⊢ (Fun G \land G \in V \land Z \in W) \to ({finSupp}_{Z} (G) \leftrightarrow G supp Z \in Fin)$
6	4 5	syl	$⊢ ((G \in V \land Fun G \land Z \in W) \land (F \in Fin \land G supp Z \subseteq F)) \to ({finSupp}_{Z} (G) \leftrightarrow G supp Z \in Fin)$
7	2 6	mpbird	$⊢ ((G \in V \land Fun G \land Z \in W) \land (F \in Fin \land G supp Z \subseteq F)) \to {finSupp}_{Z} (G)$

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