resiexd - Metamath Proof Explorer

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Theorem resiexd 7232

Description: The restriction of the identity relation to a set is a set. (Contributed by AV, 15-Feb-2020.)

**Hypothesis**
Ref	Expression
resiexd.b	⊢ (𝜑 → 𝐵 ∈ 𝑉)

**Assertion**
Ref	Expression
resiexd	⊢ (𝜑 → ( I ↾ 𝐵) ∈ V)

**Proof of Theorem resiexd**
Step	Hyp	Ref	Expression
1		funi 6588	. 2 ⊢ Fun I
2		resiexd.b	. 2 ⊢ (𝜑 → 𝐵 ∈ 𝑉)
3		resfunexg 7231	. 2 ⊢ ((Fun I ∧ 𝐵 ∈ 𝑉) → ( I ↾ 𝐵) ∈ V)
4	1, 2, 3	sylancr 585	1 ⊢ (𝜑 → ( I ↾ 𝐵) ∈ V)

Colors of variables: wff setvar class

Syntax hints: → wi 4 ∈ wcel 2098 Vcvv 3471 I cid 5577 ↾ cres 5682 Fun wfun 6545

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1789 ax-4 1803 ax-5 1905 ax-6 1963 ax-7 2003 ax-8 2100 ax-9 2108 ax-10 2129 ax-11 2146 ax-12 2166 ax-ext 2698 ax-rep 5287 ax-sep 5301 ax-nul 5308 ax-pr 5431

This theorem depends on definitions: df-bi 206 df-an 395 df-or 846 df-3an 1086 df-tru 1536 df-fal 1546 df-ex 1774 df-nf 1778 df-sb 2060 df-mo 2529 df-eu 2558 df-clab 2705 df-cleq 2719 df-clel 2805 df-nfc 2880 df-ne 2937 df-ral 3058 df-rex 3067 df-reu 3373 df-rab 3429 df-v 3473 df-sbc 3777 df-csb 3893 df-dif 3950 df-un 3952 df-in 3954 df-ss 3964 df-nul 4325 df-if 4531 df-sn 4631 df-pr 4633 df-op 4637 df-uni 4911 df-iun 5000 df-br 5151 df-opab 5213 df-mpt 5234 df-id 5578 df-xp 5686 df-rel 5687 df-cnv 5688 df-co 5689 df-dm 5690 df-rn 5691 df-res 5692 df-ima 5693 df-iota 6503 df-fun 6553 df-fn 6554 df-f 6555 df-f1 6556 df-fo 6557 df-f1o 6558 df-fv 6559