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Theorem subcss1 16325
Description: The objects of a subcategory are a subset of the objects of the original. (Contributed by Mario Carneiro, 4-Jan-2017.)
Hypotheses
Ref Expression
subcss1.1 (𝜑𝐽 ∈ (Subcat‘𝐶))
subcss1.2 (𝜑𝐽 Fn (𝑆 × 𝑆))
subcss1.b 𝐵 = (Base‘𝐶)
Assertion
Ref Expression
subcss1 (𝜑𝑆𝐵)

Proof of Theorem subcss1
StepHypRef Expression
1 subcss1.2 . 2 (𝜑𝐽 Fn (𝑆 × 𝑆))
2 eqid 2610 . . . 4 (Homf𝐶) = (Homf𝐶)
3 subcss1.b . . . 4 𝐵 = (Base‘𝐶)
42, 3homffn 16176 . . 3 (Homf𝐶) Fn (𝐵 × 𝐵)
54a1i 11 . 2 (𝜑 → (Homf𝐶) Fn (𝐵 × 𝐵))
6 subcss1.1 . . 3 (𝜑𝐽 ∈ (Subcat‘𝐶))
76, 2subcssc 16323 . 2 (𝜑𝐽cat (Homf𝐶))
81, 5, 7ssc1 16304 1 (𝜑𝑆𝐵)
Colors of variables: wff setvar class
Syntax hints:  wi 4   = wceq 1475  wcel 1977  wss 3540   × cxp 5036   Fn wfn 5799  cfv 5804  Basecbs 15695  Homf chomf 16150  Subcatcsubc 16292
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1713  ax-4 1728  ax-5 1827  ax-6 1875  ax-7 1922  ax-8 1979  ax-9 1986  ax-10 2006  ax-11 2021  ax-12 2034  ax-13 2234  ax-ext 2590  ax-rep 4699  ax-sep 4709  ax-nul 4717  ax-pow 4769  ax-pr 4833  ax-un 6847
This theorem depends on definitions:  df-bi 196  df-or 384  df-an 385  df-3an 1033  df-tru 1478  df-fal 1481  df-ex 1696  df-nf 1701  df-sb 1868  df-eu 2462  df-mo 2463  df-clab 2597  df-cleq 2603  df-clel 2606  df-nfc 2740  df-ne 2782  df-ral 2901  df-rex 2902  df-reu 2903  df-rab 2905  df-v 3175  df-sbc 3403  df-csb 3500  df-dif 3543  df-un 3545  df-in 3547  df-ss 3554  df-nul 3875  df-if 4037  df-pw 4110  df-sn 4126  df-pr 4128  df-op 4132  df-uni 4373  df-iun 4457  df-br 4584  df-opab 4644  df-mpt 4645  df-id 4953  df-xp 5044  df-rel 5045  df-cnv 5046  df-co 5047  df-dm 5048  df-rn 5049  df-res 5050  df-ima 5051  df-iota 5768  df-fun 5806  df-fn 5807  df-f 5808  df-f1 5809  df-fo 5810  df-f1o 5811  df-fv 5812  df-ov 6552  df-oprab 6553  df-mpt2 6554  df-1st 7059  df-2nd 7060  df-pm 7747  df-ixp 7795  df-homf 16154  df-ssc 16293  df-subc 16295
This theorem is referenced by:  subcss2  16326  subccatid  16329  subsubc  16336  funcres  16379  funcres2b  16380  funcres2  16381  idfusubc  41656
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