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Theorem f1imaeng 8256
Description: A one-to-one function's image under a subset of its domain is equinumerous to the subset. (Contributed by Mario Carneiro, 15-May-2015.)
Assertion
Ref Expression
f1imaeng ((𝐹:𝐴1-1𝐵𝐶𝐴𝐶𝑉) → (𝐹𝐶) ≈ 𝐶)

Proof of Theorem f1imaeng
StepHypRef Expression
1 f1ores 6371 . . 3 ((𝐹:𝐴1-1𝐵𝐶𝐴) → (𝐹𝐶):𝐶1-1-onto→(𝐹𝐶))
2 f1oeng 8215 . . . 4 ((𝐶𝑉 ∧ (𝐹𝐶):𝐶1-1-onto→(𝐹𝐶)) → 𝐶 ≈ (𝐹𝐶))
32ancoms 451 . . 3 (((𝐹𝐶):𝐶1-1-onto→(𝐹𝐶) ∧ 𝐶𝑉) → 𝐶 ≈ (𝐹𝐶))
41, 3stoic3 1872 . 2 ((𝐹:𝐴1-1𝐵𝐶𝐴𝐶𝑉) → 𝐶 ≈ (𝐹𝐶))
54ensymd 8247 1 ((𝐹:𝐴1-1𝐵𝐶𝐴𝐶𝑉) → (𝐹𝐶) ≈ 𝐶)
Colors of variables: wff setvar class
Syntax hints:  wi 4  w3a 1108  wcel 2157  wss 3770   class class class wbr 4844  cres 5315  cima 5316  1-1wf1 6099  1-1-ontowf1o 6101  cen 8193
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1891  ax-4 1905  ax-5 2006  ax-6 2072  ax-7 2107  ax-8 2159  ax-9 2166  ax-10 2185  ax-11 2200  ax-12 2213  ax-13 2378  ax-ext 2778  ax-rep 4965  ax-sep 4976  ax-nul 4984  ax-pow 5036  ax-pr 5098  ax-un 7184
This theorem depends on definitions:  df-bi 199  df-an 386  df-or 875  df-3an 1110  df-tru 1657  df-ex 1876  df-nf 1880  df-sb 2065  df-mo 2592  df-eu 2610  df-clab 2787  df-cleq 2793  df-clel 2796  df-nfc 2931  df-ne 2973  df-ral 3095  df-rex 3096  df-reu 3097  df-rab 3099  df-v 3388  df-sbc 3635  df-csb 3730  df-dif 3773  df-un 3775  df-in 3777  df-ss 3784  df-nul 4117  df-if 4279  df-pw 4352  df-sn 4370  df-pr 4372  df-op 4376  df-uni 4630  df-iun 4713  df-br 4845  df-opab 4907  df-mpt 4924  df-id 5221  df-xp 5319  df-rel 5320  df-cnv 5321  df-co 5322  df-dm 5323  df-rn 5324  df-res 5325  df-ima 5326  df-iota 6065  df-fun 6104  df-fn 6105  df-f 6106  df-f1 6107  df-fo 6108  df-f1o 6109  df-fv 6110  df-er 7983  df-en 8197
This theorem is referenced by:  f1imaen  8258  ackbij1b  9350  enfin1ai  9495  isercolllem2  14736  pmtrfconj  18197  ballotlemro  31100
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