resiexd - Metamath Proof Explorer

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Theorem resiexd 6956

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 6356	. 2 ⊢ Fun I
2		resiexd.b	. 2 ⊢ (𝜑 → 𝐵 ∈ 𝑉)
3		resfunexg 6955	. 2 ⊢ ((Fun I ∧ 𝐵 ∈ 𝑉) → ( I ↾ 𝐵) ∈ V)
4	1, 2, 3	sylancr 590	1 ⊢ (𝜑 → ( I ↾ 𝐵) ∈ V)

Colors of variables: wff setvar class

Syntax hints: → wi 4 ∈ wcel 2111 Vcvv 3441 I cid 5424 ↾ cres 5521 Fun wfun 6318

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 1911 ax-6 1970 ax-7 2015 ax-8 2113 ax-9 2121 ax-10 2142 ax-11 2158 ax-12 2175 ax-ext 2770 ax-rep 5154 ax-sep 5167 ax-nul 5174 ax-pr 5295

This theorem depends on definitions: df-bi 210 df-an 400 df-or 845 df-3an 1086 df-tru 1541 df-ex 1782 df-nf 1786 df-sb 2070 df-mo 2598 df-eu 2629 df-clab 2777 df-cleq 2791 df-clel 2870 df-nfc 2938 df-ne 2988 df-ral 3111 df-rex 3112 df-reu 3113 df-rab 3115 df-v 3443 df-sbc 3721 df-csb 3829 df-dif 3884 df-un 3886 df-in 3888 df-ss 3898 df-nul 4244 df-if 4426 df-sn 4526 df-pr 4528 df-op 4532 df-uni 4801 df-iun 4883 df-br 5031 df-opab 5093 df-mpt 5111 df-id 5425 df-xp 5525 df-rel 5526 df-cnv 5527 df-co 5528 df-dm 5529 df-rn 5530 df-res 5531 df-ima 5532 df-iota 6283 df-fun 6326 df-fn 6327 df-f 6328 df-f1 6329 df-fo 6330 df-f1o 6331 df-fv 6332