resiexd - Metamath Proof Explorer

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Theorem resiexd 7092

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 6466	. 2 ⊢ Fun I
2		resiexd.b	. 2 ⊢ (𝜑 → 𝐵 ∈ 𝑉)
3		resfunexg 7091	. 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 3432 I cid 5488 ↾ cres 5591 Fun wfun 6427

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1798 ax-4 1812 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 2709 ax-rep 5209 ax-sep 5223 ax-nul 5230 ax-pr 5352

This theorem depends on definitions: df-bi 206 df-an 397 df-or 845 df-3an 1088 df-tru 1542 df-fal 1552 df-ex 1783 df-nf 1787 df-sb 2068 df-mo 2540 df-eu 2569 df-clab 2716 df-cleq 2730 df-clel 2816 df-nfc 2889 df-ne 2944 df-ral 3069 df-rex 3070 df-reu 3072 df-rab 3073 df-v 3434 df-sbc 3717 df-csb 3833 df-dif 3890 df-un 3892 df-in 3894 df-ss 3904 df-nul 4257 df-if 4460 df-sn 4562 df-pr 4564 df-op 4568 df-uni 4840 df-iun 4926 df-br 5075 df-opab 5137 df-mpt 5158 df-id 5489 df-xp 5595 df-rel 5596 df-cnv 5597 df-co 5598 df-dm 5599 df-rn 5600 df-res 5601 df-ima 5602 df-iota 6391 df-fun 6435 df-fn 6436 df-f 6437 df-f1 6438 df-fo 6439 df-f1o 6440 df-fv 6441