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Theorem f1resf1 5552
Description: The restriction of an injective function is injective. (Contributed by AV, 28-Jun-2022.)
Assertion
Ref Expression
f1resf1  |-  ( ( ( F : A -1-1-> B  /\  C  C_  A
)  /\  ( F  |`  C ) : C --> D )  ->  ( F  |`  C ) : C -1-1-> D )

Proof of Theorem f1resf1
StepHypRef Expression
1 f1ssres 5551 . 2  |-  ( ( F : A -1-1-> B  /\  C  C_  A )  ->  ( F  |`  C ) : C -1-1-> B )
2 f1ff1 5550 . 2  |-  ( ( ( F  |`  C ) : C -1-1-> B  /\  ( F  |`  C ) : C --> D )  ->  ( F  |`  C ) : C -1-1-> D )
31, 2sylan 283 1  |-  ( ( ( F : A -1-1-> B  /\  C  C_  A
)  /\  ( F  |`  C ) : C --> D )  ->  ( F  |`  C ) : C -1-1-> D )
Colors of variables: wff set class
Syntax hints:    -> wi 4    /\ wa 104    C_ wss 3200    |` cres 4727   -->wf 5322   -1-1->wf1 5323
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 716  ax-5 1495  ax-7 1496  ax-gen 1497  ax-ie1 1541  ax-ie2 1542  ax-8 1552  ax-10 1553  ax-11 1554  ax-i12 1555  ax-bndl 1557  ax-4 1558  ax-17 1574  ax-i9 1578  ax-ial 1582  ax-i5r 1583  ax-14 2205  ax-ext 2213  ax-sep 4207  ax-pow 4264  ax-pr 4299
This theorem depends on definitions:  df-bi 117  df-3an 1006  df-tru 1400  df-nf 1509  df-sb 1811  df-clab 2218  df-cleq 2224  df-clel 2227  df-nfc 2363  df-ral 2515  df-rex 2516  df-v 2804  df-un 3204  df-in 3206  df-ss 3213  df-pw 3654  df-sn 3675  df-pr 3676  df-op 3678  df-br 4089  df-opab 4151  df-xp 4731  df-rel 4732  df-cnv 4733  df-co 4734  df-dm 4735  df-rn 4736  df-res 4737  df-fun 5328  df-fn 5329  df-f 5330  df-f1 5331
This theorem is referenced by: (None)
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