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Theorem numth 10531
Description: Numeration theorem: every set can be put into one-to-one correspondence with some ordinal (using AC). Theorem 10.3 of [TakeutiZaring] p. 84. (Contributed by NM, 10-Feb-1997.) (Proof shortened by Mario Carneiro, 8-Jan-2015.)
Hypothesis
Ref Expression
numth.1 𝐴 ∈ V
Assertion
Ref Expression
numth ∃𝑥 ∈ On ∃𝑓 𝑓:𝑥–1-1-onto→𝐴
Distinct variable group:   𝑥,𝑓,𝐴

Proof of Theorem numth
StepHypRef Expression
1 numth.1 . . 3 𝐴 ∈ V
21numth2 10530 . 2 ∃𝑥 ∈ On 𝑥 ≈ 𝐴
3 bren 8967 . . 3 (𝑥 ≈ 𝐴 ↔ ∃𝑓 𝑓:𝑥–1-1-onto→𝐴)
43rexbii 3110 . 2 (∃𝑥 ∈ On 𝑥 ≈ 𝐴 ↔ ∃𝑥 ∈ On ∃𝑓 𝑓:𝑥–1-1-onto→𝐴)
52, 4mpbi 233 1 ∃𝑥 ∈ On ∃𝑓 𝑓:𝑥–1-1-onto→𝐴
Colors of variables:    wff setvar class
This proof depends on syntax axioms:  ∃wex 1812   ∈ wcel 2145  ∃wrex 3087  Vcvv 3451   class class class wbr 5103  Oncon0 6355  –1-1-onto→wf1o 6530   ≈ cen 8954
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1828  ax-4 1842  ax-5 1943  ax-6 2000  ax-7 2041  ax-8 2147  ax-9 2155  ax-10 2178  ax-11 2194  ax-12 2213  ax-ext 2733  ax-rep 5232  ax-sep 5249  ax-nul 5260  ax-pow 5327  ax-pr 5391  ax-un 7740  ax-ac2 10522
This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3or 1104  df-3an 1105  df-tru 1573  df-fal 1583  df-ex 1813  df-nf 1817  df-sb 2100  df-mo 2565  df-eu 2595  df-clab 2740  df-cleq 2753  df-clel 2836  df-nfc 2910  df-ne 2957  df-ral 3078  df-rex 3088  df-rmo 3366  df-reu 3367  df-rab 3414  df-v 3453  df-sbc 3740  df-csb 3848  df-dif 3902  df-un 3904  df-in 3906  df-ss 3916  df-pss 3919  df-nul 4280  df-if 4483  df-pw 4559  df-sn 4585  df-pr 4587  df-op 4591  df-uni 4868  df-int 4908  df-iun 4953  df-br 5104  df-opab 5168  df-mpt 5187  df-tr 5213  df-id 5546  df-eprel 5551  df-po 5559  df-so 5560  df-fr 5604  df-se 5605  df-we 5606  df-xp 5657  df-rel 5658  df-cnv 5659  df-co 5660  df-dm 5661  df-rn 5662  df-res 5663  df-ima 5664  df-pred 6297  df-ord 6358  df-on 6359  df-suc 6361  df-iota 6487  df-fun 6533  df-fn 6534  df-f 6535  df-f1 6536  df-fo 6537  df-f1o 6538  df-fv 6539  df-isom 6540  df-riota 7369  df-ov 7415  df-2nd 7991  df-frecs 8283  df-wrecs 8314  df-recs 8363  df-en 8958  df-card 10001  df-ac 10176
This theorem is used by: (None)
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