ILE Home Intuitionistic Logic Explorer < Previous   Next >
Nearby theorems
Mirrors  >  Home  >  ILE Home  >  Th. List  >  f1resf1 GIF version

Theorem f1resf1 5582
Description: The restriction of an injective function is injective. (Contributed by AV, 28-Jun-2022.)
Assertion
Ref Expression
f1resf1 (((𝐹:𝐴1-1𝐵𝐶𝐴) ∧ (𝐹𝐶):𝐶𝐷) → (𝐹𝐶):𝐶1-1𝐷)

Proof of Theorem f1resf1
StepHypRef Expression
1 f1ssres 5581 . 2 ((𝐹:𝐴1-1𝐵𝐶𝐴) → (𝐹𝐶):𝐶1-1𝐵)
2 f1ff1 5580 . 2 (((𝐹𝐶):𝐶1-1𝐵 ∧ (𝐹𝐶):𝐶𝐷) → (𝐹𝐶):𝐶1-1𝐷)
31, 2sylan 283 1 (((𝐹:𝐴1-1𝐵𝐶𝐴) ∧ (𝐹𝐶):𝐶𝐷) → (𝐹𝐶):𝐶1-1𝐷)
Colors of variables: wff set class
Syntax hints:  wi 4  wa 104  wss 3210  cres 4750  wf 5347  1-1wf1 5348
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-io 717  ax-5 1496  ax-7 1497  ax-gen 1498  ax-ie1 1542  ax-ie2 1543  ax-8 1553  ax-10 1554  ax-11 1555  ax-i12 1556  ax-bndl 1558  ax-4 1559  ax-17 1575  ax-i9 1579  ax-ial 1583  ax-i5r 1584  ax-14 2206  ax-ext 2214  ax-sep 4227  ax-pow 4286  ax-pr 4321
This theorem depends on definitions:  df-bi 117  df-3an 1007  df-tru 1401  df-nf 1510  df-sb 1812  df-clab 2219  df-cleq 2225  df-clel 2228  df-nfc 2373  df-ral 2525  df-rex 2526  df-v 2814  df-un 3214  df-in 3216  df-ss 3223  df-pw 3670  df-sn 3694  df-pr 3695  df-op 3697  df-br 4109  df-opab 4171  df-xp 4754  df-rel 4755  df-cnv 4756  df-co 4757  df-dm 4758  df-rn 4759  df-res 4760  df-fun 5353  df-fn 5354  df-f 5355  df-f1 5356
This theorem is referenced by: (None)
  Copyright terms: Public domain W3C validator