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Theorem indcardi 9075
Description: Indirect strong induction on the cardinality of a finite or numerable set. (Contributed by Stefan O'Rear, 24-Aug-2015.)
Hypotheses
Ref Expression
indcardi.a (𝜑𝐴𝑉)
indcardi.b (𝜑𝑇 ∈ dom card)
indcardi.c ((𝜑𝑅𝑇 ∧ ∀𝑦(𝑆𝑅𝜒)) → 𝜓)
indcardi.d (𝑥 = 𝑦 → (𝜓𝜒))
indcardi.e (𝑥 = 𝐴 → (𝜓𝜃))
indcardi.f (𝑥 = 𝑦𝑅 = 𝑆)
indcardi.g (𝑥 = 𝐴𝑅 = 𝑇)
Assertion
Ref Expression
indcardi (𝜑𝜃)
Distinct variable groups:   𝑥,𝑦,𝑇   𝑥,𝐴   𝑥,𝑆   𝜒,𝑥   𝜑,𝑥,𝑦   𝜃,𝑥   𝑦,𝑅   𝜓,𝑦
Allowed substitution hints:   𝜓(𝑥)   𝜒(𝑦)   𝜃(𝑦)   𝐴(𝑦)   𝑅(𝑥)   𝑆(𝑦)   𝑉(𝑥,𝑦)

Proof of Theorem indcardi
StepHypRef Expression
1 indcardi.b . . 3 (𝜑𝑇 ∈ dom card)
2 domrefg 8159 . . 3 (𝑇 ∈ dom card → 𝑇𝑇)
31, 2syl 17 . 2 (𝜑𝑇𝑇)
4 indcardi.a . . 3 (𝜑𝐴𝑉)
5 cardon 8981 . . . 4 (card‘𝑇) ∈ On
65a1i 11 . . 3 (𝜑 → (card‘𝑇) ∈ On)
7 simpl1 1228 . . . . 5 (((𝜑 ∧ ((card‘𝑅) ∈ On ∧ (card‘𝑅) ⊆ (card‘𝑇)) ∧ ∀𝑦((card‘𝑆) ∈ (card‘𝑅) → (𝑆𝑇𝜒))) ∧ 𝑅𝑇) → 𝜑)
8 simpr 479 . . . . 5 (((𝜑 ∧ ((card‘𝑅) ∈ On ∧ (card‘𝑅) ⊆ (card‘𝑇)) ∧ ∀𝑦((card‘𝑆) ∈ (card‘𝑅) → (𝑆𝑇𝜒))) ∧ 𝑅𝑇) → 𝑅𝑇)
9 simpr 479 . . . . . . . . . . . . 13 (((𝜑 ∧ ((card‘𝑅) ∈ On ∧ (card‘𝑅) ⊆ (card‘𝑇)) ∧ 𝑅𝑇) ∧ 𝑆𝑅) → 𝑆𝑅)
10 simpl1 1228 . . . . . . . . . . . . . . . 16 (((𝜑 ∧ ((card‘𝑅) ∈ On ∧ (card‘𝑅) ⊆ (card‘𝑇)) ∧ 𝑅𝑇) ∧ 𝑆𝑅) → 𝜑)
1110, 1syl 17 . . . . . . . . . . . . . . 15 (((𝜑 ∧ ((card‘𝑅) ∈ On ∧ (card‘𝑅) ⊆ (card‘𝑇)) ∧ 𝑅𝑇) ∧ 𝑆𝑅) → 𝑇 ∈ dom card)
12 sdomdom 8152 . . . . . . . . . . . . . . . . 17 (𝑆𝑅𝑆𝑅)
1312adantl 473 . . . . . . . . . . . . . . . 16 (((𝜑 ∧ ((card‘𝑅) ∈ On ∧ (card‘𝑅) ⊆ (card‘𝑇)) ∧ 𝑅𝑇) ∧ 𝑆𝑅) → 𝑆𝑅)
14 simpl3 1232 . . . . . . . . . . . . . . . 16 (((𝜑 ∧ ((card‘𝑅) ∈ On ∧ (card‘𝑅) ⊆ (card‘𝑇)) ∧ 𝑅𝑇) ∧ 𝑆𝑅) → 𝑅𝑇)
15 domtr 8177 . . . . . . . . . . . . . . . 16 ((𝑆𝑅𝑅𝑇) → 𝑆𝑇)
1613, 14, 15syl2anc 696 . . . . . . . . . . . . . . 15 (((𝜑 ∧ ((card‘𝑅) ∈ On ∧ (card‘𝑅) ⊆ (card‘𝑇)) ∧ 𝑅𝑇) ∧ 𝑆𝑅) → 𝑆𝑇)
17 numdom 9072 . . . . . . . . . . . . . . 15 ((𝑇 ∈ dom card ∧ 𝑆𝑇) → 𝑆 ∈ dom card)
1811, 16, 17syl2anc 696 . . . . . . . . . . . . . 14 (((𝜑 ∧ ((card‘𝑅) ∈ On ∧ (card‘𝑅) ⊆ (card‘𝑇)) ∧ 𝑅𝑇) ∧ 𝑆𝑅) → 𝑆 ∈ dom card)
19 numdom 9072 . . . . . . . . . . . . . . 15 ((𝑇 ∈ dom card ∧ 𝑅𝑇) → 𝑅 ∈ dom card)
2011, 14, 19syl2anc 696 . . . . . . . . . . . . . 14 (((𝜑 ∧ ((card‘𝑅) ∈ On ∧ (card‘𝑅) ⊆ (card‘𝑇)) ∧ 𝑅𝑇) ∧ 𝑆𝑅) → 𝑅 ∈ dom card)
21 cardsdom2 9025 . . . . . . . . . . . . . 14 ((𝑆 ∈ dom card ∧ 𝑅 ∈ dom card) → ((card‘𝑆) ∈ (card‘𝑅) ↔ 𝑆𝑅))
2218, 20, 21syl2anc 696 . . . . . . . . . . . . 13 (((𝜑 ∧ ((card‘𝑅) ∈ On ∧ (card‘𝑅) ⊆ (card‘𝑇)) ∧ 𝑅𝑇) ∧ 𝑆𝑅) → ((card‘𝑆) ∈ (card‘𝑅) ↔ 𝑆𝑅))
239, 22mpbird 247 . . . . . . . . . . . 12 (((𝜑 ∧ ((card‘𝑅) ∈ On ∧ (card‘𝑅) ⊆ (card‘𝑇)) ∧ 𝑅𝑇) ∧ 𝑆𝑅) → (card‘𝑆) ∈ (card‘𝑅))
24 id 22 . . . . . . . . . . . . 13 (((card‘𝑆) ∈ (card‘𝑅) → (𝑆𝑇𝜒)) → ((card‘𝑆) ∈ (card‘𝑅) → (𝑆𝑇𝜒)))
2524com3l 89 . . . . . . . . . . . 12 ((card‘𝑆) ∈ (card‘𝑅) → (𝑆𝑇 → (((card‘𝑆) ∈ (card‘𝑅) → (𝑆𝑇𝜒)) → 𝜒)))
2623, 16, 25sylc 65 . . . . . . . . . . 11 (((𝜑 ∧ ((card‘𝑅) ∈ On ∧ (card‘𝑅) ⊆ (card‘𝑇)) ∧ 𝑅𝑇) ∧ 𝑆𝑅) → (((card‘𝑆) ∈ (card‘𝑅) → (𝑆𝑇𝜒)) → 𝜒))
2726ex 449 . . . . . . . . . 10 ((𝜑 ∧ ((card‘𝑅) ∈ On ∧ (card‘𝑅) ⊆ (card‘𝑇)) ∧ 𝑅𝑇) → (𝑆𝑅 → (((card‘𝑆) ∈ (card‘𝑅) → (𝑆𝑇𝜒)) → 𝜒)))
2827com23 86 . . . . . . . . 9 ((𝜑 ∧ ((card‘𝑅) ∈ On ∧ (card‘𝑅) ⊆ (card‘𝑇)) ∧ 𝑅𝑇) → (((card‘𝑆) ∈ (card‘𝑅) → (𝑆𝑇𝜒)) → (𝑆𝑅𝜒)))
2928alimdv 1995 . . . . . . . 8 ((𝜑 ∧ ((card‘𝑅) ∈ On ∧ (card‘𝑅) ⊆ (card‘𝑇)) ∧ 𝑅𝑇) → (∀𝑦((card‘𝑆) ∈ (card‘𝑅) → (𝑆𝑇𝜒)) → ∀𝑦(𝑆𝑅𝜒)))
30293exp 1113 . . . . . . 7 (𝜑 → (((card‘𝑅) ∈ On ∧ (card‘𝑅) ⊆ (card‘𝑇)) → (𝑅𝑇 → (∀𝑦((card‘𝑆) ∈ (card‘𝑅) → (𝑆𝑇𝜒)) → ∀𝑦(𝑆𝑅𝜒)))))
3130com34 91 . . . . . 6 (𝜑 → (((card‘𝑅) ∈ On ∧ (card‘𝑅) ⊆ (card‘𝑇)) → (∀𝑦((card‘𝑆) ∈ (card‘𝑅) → (𝑆𝑇𝜒)) → (𝑅𝑇 → ∀𝑦(𝑆𝑅𝜒)))))
32313imp1 1441 . . . . 5 (((𝜑 ∧ ((card‘𝑅) ∈ On ∧ (card‘𝑅) ⊆ (card‘𝑇)) ∧ ∀𝑦((card‘𝑆) ∈ (card‘𝑅) → (𝑆𝑇𝜒))) ∧ 𝑅𝑇) → ∀𝑦(𝑆𝑅𝜒))
33 indcardi.c . . . . 5 ((𝜑𝑅𝑇 ∧ ∀𝑦(𝑆𝑅𝜒)) → 𝜓)
347, 8, 32, 33syl3anc 1477 . . . 4 (((𝜑 ∧ ((card‘𝑅) ∈ On ∧ (card‘𝑅) ⊆ (card‘𝑇)) ∧ ∀𝑦((card‘𝑆) ∈ (card‘𝑅) → (𝑆𝑇𝜒))) ∧ 𝑅𝑇) → 𝜓)
3534ex 449 . . 3 ((𝜑 ∧ ((card‘𝑅) ∈ On ∧ (card‘𝑅) ⊆ (card‘𝑇)) ∧ ∀𝑦((card‘𝑆) ∈ (card‘𝑅) → (𝑆𝑇𝜒))) → (𝑅𝑇𝜓))
36 indcardi.f . . . . 5 (𝑥 = 𝑦𝑅 = 𝑆)
3736breq1d 4815 . . . 4 (𝑥 = 𝑦 → (𝑅𝑇𝑆𝑇))
38 indcardi.d . . . 4 (𝑥 = 𝑦 → (𝜓𝜒))
3937, 38imbi12d 333 . . 3 (𝑥 = 𝑦 → ((𝑅𝑇𝜓) ↔ (𝑆𝑇𝜒)))
40 indcardi.g . . . . 5 (𝑥 = 𝐴𝑅 = 𝑇)
4140breq1d 4815 . . . 4 (𝑥 = 𝐴 → (𝑅𝑇𝑇𝑇))
42 indcardi.e . . . 4 (𝑥 = 𝐴 → (𝜓𝜃))
4341, 42imbi12d 333 . . 3 (𝑥 = 𝐴 → ((𝑅𝑇𝜓) ↔ (𝑇𝑇𝜃)))
4436fveq2d 6358 . . 3 (𝑥 = 𝑦 → (card‘𝑅) = (card‘𝑆))
4540fveq2d 6358 . . 3 (𝑥 = 𝐴 → (card‘𝑅) = (card‘𝑇))
464, 6, 35, 39, 43, 44, 45tfisi 7225 . 2 (𝜑 → (𝑇𝑇𝜃))
473, 46mpd 15 1 (𝜑𝜃)
Colors of variables: wff setvar class
Syntax hints:  wi 4  wb 196  wa 383  w3a 1072  wal 1630   = wceq 1632  wcel 2140  wss 3716   class class class wbr 4805  dom cdm 5267  Oncon0 5885  cfv 6050  cdom 8122  csdm 8123  cardccrd 8972
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1871  ax-4 1886  ax-5 1989  ax-6 2055  ax-7 2091  ax-8 2142  ax-9 2149  ax-10 2169  ax-11 2184  ax-12 2197  ax-13 2392  ax-ext 2741  ax-rep 4924  ax-sep 4934  ax-nul 4942  ax-pow 4993  ax-pr 5056  ax-un 7116
This theorem depends on definitions:  df-bi 197  df-or 384  df-an 385  df-3or 1073  df-3an 1074  df-tru 1635  df-ex 1854  df-nf 1859  df-sb 2048  df-eu 2612  df-mo 2613  df-clab 2748  df-cleq 2754  df-clel 2757  df-nfc 2892  df-ne 2934  df-ral 3056  df-rex 3057  df-reu 3058  df-rmo 3059  df-rab 3060  df-v 3343  df-sbc 3578  df-csb 3676  df-dif 3719  df-un 3721  df-in 3723  df-ss 3730  df-pss 3732  df-nul 4060  df-if 4232  df-pw 4305  df-sn 4323  df-pr 4325  df-tp 4327  df-op 4329  df-uni 4590  df-int 4629  df-iun 4675  df-br 4806  df-opab 4866  df-mpt 4883  df-tr 4906  df-id 5175  df-eprel 5180  df-po 5188  df-so 5189  df-fr 5226  df-se 5227  df-we 5228  df-xp 5273  df-rel 5274  df-cnv 5275  df-co 5276  df-dm 5277  df-rn 5278  df-res 5279  df-ima 5280  df-pred 5842  df-ord 5888  df-on 5889  df-suc 5891  df-iota 6013  df-fun 6052  df-fn 6053  df-f 6054  df-f1 6055  df-fo 6056  df-f1o 6057  df-fv 6058  df-isom 6059  df-riota 6776  df-wrecs 7578  df-recs 7639  df-er 7914  df-en 8125  df-dom 8126  df-sdom 8127  df-card 8976
This theorem is referenced by:  uzindi  12996  symggen  18111
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