Theorem wunf 9863

Description: A weak universe is closed under functions with known domain and codomain. (Contributed by Mario Carneiro, 2-Jan-2017.)

Hypotheses

Ref	Expression
wun0.1	⊢ (𝜑 → 𝑈 ∈ WUni)
wunop.2	⊢ (𝜑 → 𝐴 ∈ 𝑈)
wunop.3	⊢ (𝜑 → 𝐵 ∈ 𝑈)
wunf.3	⊢ (𝜑 → 𝐹:𝐴⟶𝐵)

Assertion

Ref	Expression
wunf	⊢ (𝜑 → 𝐹 ∈ 𝑈)

Proof of Theorem wunf

Step	Hyp	Ref	Expression
1		wun0.1	. . 3 ⊢ (𝜑 → 𝑈 ∈ WUni)
2		wunop.3	. . . 4 ⊢ (𝜑 → 𝐵 ∈ 𝑈)
3		wunop.2	. . . 4 ⊢ (𝜑 → 𝐴 ∈ 𝑈)
4	1, 2, 3	wunmap 9862	. . 3 ⊢ (𝜑 → (𝐵 ↑𝑚 𝐴) ∈ 𝑈)
5	1, 4	wunelss 9844	. 2 ⊢ (𝜑 → (𝐵 ↑𝑚 𝐴) ⊆ 𝑈)
6		wunf.3	. . 3 ⊢ (𝜑 → 𝐹:𝐴⟶𝐵)
7	2, 3	elmapd 8135	. . 3 ⊢ (𝜑 → (𝐹 ∈ (𝐵 ↑𝑚 𝐴) ↔ 𝐹:𝐴⟶𝐵))
8	6, 7	mpbird 249	. 2 ⊢ (𝜑 → 𝐹 ∈ (𝐵 ↑𝑚 𝐴))
9	5, 8	sseldd 3827	1 ⊢ (𝜑 → 𝐹 ∈ 𝑈)

Syntax hints:   → wi 4   ∈ wcel 2166  ⟶wf 6118  (class class class)co 6904   ↑_𝑚 cmap 8121  WUnicwun 9836

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1896  ax-4 1910  ax-5 2011  ax-6 2077  ax-7 2114  ax-8 2168  ax-9 2175  ax-10 2194  ax-11 2209  ax-12 2222  ax-13 2390  ax-ext 2802  ax-sep 5004  ax-nul 5012  ax-pow 5064  ax-pr 5126  ax-un 7208

This theorem depends on definitions:  df-bi 199  df-an 387  df-or 881  df-3an 1115  df-tru 1662  df-ex 1881  df-nf 1885  df-sb 2070  df-mo 2604  df-eu 2639  df-clab 2811  df-cleq 2817  df-clel 2820  df-nfc 2957  df-ne 2999  df-ral 3121  df-rex 3122  df-rab 3125  df-v 3415  df-sbc 3662  df-csb 3757  df-dif 3800  df-un 3802  df-in 3804  df-ss 3811  df-nul 4144  df-if 4306  df-pw 4379  df-sn 4397  df-pr 4399  df-op 4403  df-uni 4658  df-iun 4741  df-br 4873  df-opab 4935  df-mpt 4952  df-tr 4975  df-id 5249  df-xp 5347  df-rel 5348  df-cnv 5349  df-co 5350  df-dm 5351  df-rn 5352  df-res 5353  df-ima 5354  df-iota 6085  df-fun 6124  df-fn 6125  df-f 6126  df-fv 6130  df-ov 6907  df-oprab 6908  df-mpt2 6909  df-1st 7427  df-2nd 7428  df-map 8123  df-pm 8124  df-wun 9838

This theorem is referenced by:  wunndx  16242  wunnat  16967  catcoppccl  17109  catcfuccl  17110  catcxpccl  17199