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Theorem mapss2 41618
 Description: Subset inheritance for set exponentiation. (Contributed by Glauco Siliprandi, 3-Mar-2021.)
Hypotheses
Ref Expression
mapss2.a (𝜑𝐴𝑉)
mapss2.b (𝜑𝐵𝑊)
mapss2.c (𝜑𝐶𝑍)
mapss2.n (𝜑𝐶 ≠ ∅)
Assertion
Ref Expression
mapss2 (𝜑 → (𝐴𝐵 ↔ (𝐴m 𝐶) ⊆ (𝐵m 𝐶)))

Proof of Theorem mapss2
Dummy variables 𝑤 𝑥 𝑦 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 mapss2.b . . . . 5 (𝜑𝐵𝑊)
21adantr 483 . . . 4 ((𝜑𝐴𝐵) → 𝐵𝑊)
3 simpr 487 . . . 4 ((𝜑𝐴𝐵) → 𝐴𝐵)
4 mapss 8427 . . . 4 ((𝐵𝑊𝐴𝐵) → (𝐴m 𝐶) ⊆ (𝐵m 𝐶))
52, 3, 4syl2anc 586 . . 3 ((𝜑𝐴𝐵) → (𝐴m 𝐶) ⊆ (𝐵m 𝐶))
65ex 415 . 2 (𝜑 → (𝐴𝐵 → (𝐴m 𝐶) ⊆ (𝐵m 𝐶)))
7 mapss2.n . . . . . 6 (𝜑𝐶 ≠ ∅)
8 n0 4282 . . . . . 6 (𝐶 ≠ ∅ ↔ ∃𝑥 𝑥𝐶)
97, 8sylib 220 . . . . 5 (𝜑 → ∃𝑥 𝑥𝐶)
109adantr 483 . . . 4 ((𝜑 ∧ (𝐴m 𝐶) ⊆ (𝐵m 𝐶)) → ∃𝑥 𝑥𝐶)
11 eqidd 2821 . . . . . . . . . . . 12 ((𝜑𝑥𝐶) → (𝑤𝐶𝑦) = (𝑤𝐶𝑦))
12 eqidd 2821 . . . . . . . . . . . 12 (((𝜑𝑥𝐶) ∧ 𝑤 = 𝑥) → 𝑦 = 𝑦)
13 simpr 487 . . . . . . . . . . . 12 ((𝜑𝑥𝐶) → 𝑥𝐶)
14 vex 3473 . . . . . . . . . . . . 13 𝑦 ∈ V
1514a1i 11 . . . . . . . . . . . 12 ((𝜑𝑥𝐶) → 𝑦 ∈ V)
1611, 12, 13, 15fvmptd 6747 . . . . . . . . . . 11 ((𝜑𝑥𝐶) → ((𝑤𝐶𝑦)‘𝑥) = 𝑦)
1716eqcomd 2826 . . . . . . . . . 10 ((𝜑𝑥𝐶) → 𝑦 = ((𝑤𝐶𝑦)‘𝑥))
1817ad4ant13 749 . . . . . . . . 9 ((((𝜑 ∧ (𝐴m 𝐶) ⊆ (𝐵m 𝐶)) ∧ 𝑥𝐶) ∧ 𝑦𝐴) → 𝑦 = ((𝑤𝐶𝑦)‘𝑥))
19 simplr 767 . . . . . . . . . . . . 13 (((𝜑 ∧ (𝐴m 𝐶) ⊆ (𝐵m 𝐶)) ∧ 𝑦𝐴) → (𝐴m 𝐶) ⊆ (𝐵m 𝐶))
20 simplr 767 . . . . . . . . . . . . . . . 16 (((𝜑𝑦𝐴) ∧ 𝑤𝐶) → 𝑦𝐴)
2120fmpttd 6851 . . . . . . . . . . . . . . 15 ((𝜑𝑦𝐴) → (𝑤𝐶𝑦):𝐶𝐴)
22 mapss2.a . . . . . . . . . . . . . . . . 17 (𝜑𝐴𝑉)
2322adantr 483 . . . . . . . . . . . . . . . 16 ((𝜑𝑦𝐴) → 𝐴𝑉)
24 mapss2.c . . . . . . . . . . . . . . . . 17 (𝜑𝐶𝑍)
2524adantr 483 . . . . . . . . . . . . . . . 16 ((𝜑𝑦𝐴) → 𝐶𝑍)
2623, 25elmapd 8394 . . . . . . . . . . . . . . 15 ((𝜑𝑦𝐴) → ((𝑤𝐶𝑦) ∈ (𝐴m 𝐶) ↔ (𝑤𝐶𝑦):𝐶𝐴))
2721, 26mpbird 259 . . . . . . . . . . . . . 14 ((𝜑𝑦𝐴) → (𝑤𝐶𝑦) ∈ (𝐴m 𝐶))
2827adantlr 713 . . . . . . . . . . . . 13 (((𝜑 ∧ (𝐴m 𝐶) ⊆ (𝐵m 𝐶)) ∧ 𝑦𝐴) → (𝑤𝐶𝑦) ∈ (𝐴m 𝐶))
2919, 28sseldd 3943 . . . . . . . . . . . 12 (((𝜑 ∧ (𝐴m 𝐶) ⊆ (𝐵m 𝐶)) ∧ 𝑦𝐴) → (𝑤𝐶𝑦) ∈ (𝐵m 𝐶))
30 elmapi 8402 . . . . . . . . . . . 12 ((𝑤𝐶𝑦) ∈ (𝐵m 𝐶) → (𝑤𝐶𝑦):𝐶𝐵)
3129, 30syl 17 . . . . . . . . . . 11 (((𝜑 ∧ (𝐴m 𝐶) ⊆ (𝐵m 𝐶)) ∧ 𝑦𝐴) → (𝑤𝐶𝑦):𝐶𝐵)
3231adantlr 713 . . . . . . . . . 10 ((((𝜑 ∧ (𝐴m 𝐶) ⊆ (𝐵m 𝐶)) ∧ 𝑥𝐶) ∧ 𝑦𝐴) → (𝑤𝐶𝑦):𝐶𝐵)
33 simplr 767 . . . . . . . . . 10 ((((𝜑 ∧ (𝐴m 𝐶) ⊆ (𝐵m 𝐶)) ∧ 𝑥𝐶) ∧ 𝑦𝐴) → 𝑥𝐶)
3432, 33ffvelrnd 6824 . . . . . . . . 9 ((((𝜑 ∧ (𝐴m 𝐶) ⊆ (𝐵m 𝐶)) ∧ 𝑥𝐶) ∧ 𝑦𝐴) → ((𝑤𝐶𝑦)‘𝑥) ∈ 𝐵)
3518, 34eqeltrd 2911 . . . . . . . 8 ((((𝜑 ∧ (𝐴m 𝐶) ⊆ (𝐵m 𝐶)) ∧ 𝑥𝐶) ∧ 𝑦𝐴) → 𝑦𝐵)
3635ralrimiva 3169 . . . . . . 7 (((𝜑 ∧ (𝐴m 𝐶) ⊆ (𝐵m 𝐶)) ∧ 𝑥𝐶) → ∀𝑦𝐴 𝑦𝐵)
37 dfss3 3931 . . . . . . 7 (𝐴𝐵 ↔ ∀𝑦𝐴 𝑦𝐵)
3836, 37sylibr 236 . . . . . 6 (((𝜑 ∧ (𝐴m 𝐶) ⊆ (𝐵m 𝐶)) ∧ 𝑥𝐶) → 𝐴𝐵)
3938ex 415 . . . . 5 ((𝜑 ∧ (𝐴m 𝐶) ⊆ (𝐵m 𝐶)) → (𝑥𝐶𝐴𝐵))
4039exlimdv 1934 . . . 4 ((𝜑 ∧ (𝐴m 𝐶) ⊆ (𝐵m 𝐶)) → (∃𝑥 𝑥𝐶𝐴𝐵))
4110, 40mpd 15 . . 3 ((𝜑 ∧ (𝐴m 𝐶) ⊆ (𝐵m 𝐶)) → 𝐴𝐵)
4241ex 415 . 2 (𝜑 → ((𝐴m 𝐶) ⊆ (𝐵m 𝐶) → 𝐴𝐵))
436, 42impbid 214 1 (𝜑 → (𝐴𝐵 ↔ (𝐴m 𝐶) ⊆ (𝐵m 𝐶)))
 Colors of variables: wff setvar class Syntax hints:   → wi 4   ↔ wb 208   ∧ wa 398   = wceq 1537  ∃wex 1780   ∈ wcel 2114   ≠ wne 3006  ∀wral 3125  Vcvv 3470   ⊆ wss 3909  ∅c0 4265   ↦ cmpt 5118  ⟶wf 6323  ‘cfv 6327  (class class class)co 7129   ↑m cmap 8380 This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1796  ax-4 1810  ax-5 1911  ax-6 1970  ax-7 2015  ax-8 2116  ax-9 2124  ax-10 2145  ax-11 2161  ax-12 2177  ax-ext 2792  ax-sep 5175  ax-nul 5182  ax-pow 5238  ax-pr 5302  ax-un 7435 This theorem depends on definitions:  df-bi 209  df-an 399  df-or 844  df-3an 1085  df-tru 1540  df-ex 1781  df-nf 1785  df-sb 2070  df-mo 2622  df-eu 2653  df-clab 2799  df-cleq 2813  df-clel 2891  df-nfc 2959  df-ne 3007  df-ral 3130  df-rex 3131  df-rab 3134  df-v 3472  df-sbc 3749  df-csb 3857  df-dif 3912  df-un 3914  df-in 3916  df-ss 3926  df-nul 4266  df-if 4440  df-pw 4513  df-sn 4540  df-pr 4542  df-op 4546  df-uni 4811  df-iun 4893  df-br 5039  df-opab 5101  df-mpt 5119  df-id 5432  df-xp 5533  df-rel 5534  df-cnv 5535  df-co 5536  df-dm 5537  df-rn 5538  df-res 5539  df-ima 5540  df-iota 6286  df-fun 6329  df-fn 6330  df-f 6331  df-fv 6335  df-ov 7132  df-oprab 7133  df-mpo 7134  df-1st 7663  df-2nd 7664  df-map 8382 This theorem is referenced by:  ovnovollem1  43082  ovnovollem2  43083
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