Theorem ecexALTV 38327

Description: Existence of a coset, like ecexg 8757 but with a weaker antecedent: only the restriction of 𝑅 by the singleton of 𝐴 needs to be a set, not 𝑅 itself, see e.g. eccnvepex 38331. (Contributed by Peter Mazsa, 22-Feb-2023.)

Assertion

Ref	Expression
ecexALTV	⊢ ((𝑅 ↾ {𝐴}) ∈ 𝑉 → [𝐴]𝑅 ∈ V)

Proof of Theorem ecexALTV

Step	Hyp	Ref	Expression
1		df-ec 8755	. 2 ⊢ [𝐴]𝑅 = (𝑅 “ {𝐴})
2		snex 5445	. . 3 ⊢ {𝐴} ∈ V
3		imaexALTV 38326	. . . 4 ⊢ ((𝑅 ∈ V ∨ ((𝑅 ↾ {𝐴}) ∈ 𝑉 ∧ {𝐴} ∈ V)) → (𝑅 “ {𝐴}) ∈ V)
4	3	olcs 877	. . 3 ⊢ (((𝑅 ↾ {𝐴}) ∈ 𝑉 ∧ {𝐴} ∈ V) → (𝑅 “ {𝐴}) ∈ V)
5	2, 4	mpan2 691	. 2 ⊢ ((𝑅 ↾ {𝐴}) ∈ 𝑉 → (𝑅 “ {𝐴}) ∈ V)
6	1, 5	eqeltrid 2845	1 ⊢ ((𝑅 ↾ {𝐴}) ∈ 𝑉 → [𝐴]𝑅 ∈ V)

Syntax hints:   → wi 4   ∧ wa 395   ∈ wcel 2108  Vcvv 3481  {csn 4634   ↾ cres 5695   “ cima 5696  [cec 8751

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1794  ax-4 1808  ax-5 1910  ax-6 1967  ax-7 2007  ax-8 2110  ax-9 2118  ax-10 2141  ax-11 2157  ax-12 2177  ax-ext 2708  ax-rep 5288  ax-sep 5305  ax-nul 5315  ax-pr 5441  ax-un 7761

This theorem depends on definitions:  df-bi 207  df-an 396  df-or 849  df-3an 1089  df-tru 1542  df-fal 1552  df-ex 1779  df-nf 1783  df-sb 2065  df-mo 2540  df-clab 2715  df-cleq 2729  df-clel 2816  df-ral 3062  df-rex 3071  df-rab 3437  df-v 3483  df-dif 3969  df-un 3971  df-in 3973  df-ss 3983  df-nul 4343  df-if 4535  df-sn 4635  df-pr 4637  df-op 4641  df-uni 4916  df-iun 5001  df-br 5152  df-opab 5214  df-xp 5699  df-rel 5700  df-cnv 5701  df-dm 5703  df-rn 5704  df-res 5705  df-ima 5706  df-ec 8755  df-qs 8759

This theorem is referenced by:  eccnvepex  38331