resiexd - Metamath Proof Explorer

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Theorem resiexd 7220

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 6580	. 2 ⊢ Fun I
2		resiexd.b	. 2 ⊢ (𝜑 → 𝐵 ∈ 𝑉)
3		resfunexg 7219	. 2 ⊢ ((Fun I ∧ 𝐵 ∈ 𝑉) → ( I ↾ 𝐵) ∈ V)
4	1, 2, 3	sylancr 587	1 ⊢ (𝜑 → ( I ↾ 𝐵) ∈ V)

Colors of variables: wff setvar class

Syntax hints: → wi 4 ∈ wcel 2106 Vcvv 3474 I cid 5573 ↾ cres 5678 Fun wfun 6537

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1913 ax-6 1971 ax-7 2011 ax-8 2108 ax-9 2116 ax-10 2137 ax-11 2154 ax-12 2171 ax-ext 2703 ax-rep 5285 ax-sep 5299 ax-nul 5306 ax-pr 5427

This theorem depends on definitions: df-bi 206 df-an 397 df-or 846 df-3an 1089 df-tru 1544 df-fal 1554 df-ex 1782 df-nf 1786 df-sb 2068 df-mo 2534 df-eu 2563 df-clab 2710 df-cleq 2724 df-clel 2810 df-nfc 2885 df-ne 2941 df-ral 3062 df-rex 3071 df-reu 3377 df-rab 3433 df-v 3476 df-sbc 3778 df-csb 3894 df-dif 3951 df-un 3953 df-in 3955 df-ss 3965 df-nul 4323 df-if 4529 df-sn 4629 df-pr 4631 df-op 4635 df-uni 4909 df-iun 4999 df-br 5149 df-opab 5211 df-mpt 5232 df-id 5574 df-xp 5682 df-rel 5683 df-cnv 5684 df-co 5685 df-dm 5686 df-rn 5687 df-res 5688 df-ima 5689 df-iota 6495 df-fun 6545 df-fn 6546 df-f 6547 df-f1 6548 df-fo 6549 df-f1o 6550 df-fv 6551