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Theorem sectid 16653
Description: The identity is a section of itself. (Contributed by AV, 8-Apr-2020.)
Hypotheses
Ref Expression
invid.b 𝐵 = (Base‘𝐶)
invid.i 𝐼 = (Id‘𝐶)
invid.c (𝜑𝐶 ∈ Cat)
invid.x (𝜑𝑋𝐵)
Assertion
Ref Expression
sectid (𝜑 → (𝐼𝑋)(𝑋(Sect‘𝐶)𝑋)(𝐼𝑋))

Proof of Theorem sectid
StepHypRef Expression
1 invid.b . . 3 𝐵 = (Base‘𝐶)
2 eqid 2771 . . 3 (Hom ‘𝐶) = (Hom ‘𝐶)
3 invid.i . . 3 𝐼 = (Id‘𝐶)
4 invid.c . . 3 (𝜑𝐶 ∈ Cat)
5 invid.x . . 3 (𝜑𝑋𝐵)
6 eqid 2771 . . 3 (comp‘𝐶) = (comp‘𝐶)
71, 2, 3, 4, 5catidcl 16550 . . 3 (𝜑 → (𝐼𝑋) ∈ (𝑋(Hom ‘𝐶)𝑋))
81, 2, 3, 4, 5, 6, 5, 7catlid 16551 . 2 (𝜑 → ((𝐼𝑋)(⟨𝑋, 𝑋⟩(comp‘𝐶)𝑋)(𝐼𝑋)) = (𝐼𝑋))
9 eqid 2771 . . 3 (Sect‘𝐶) = (Sect‘𝐶)
101, 2, 6, 3, 9, 4, 5, 5, 7, 7issect2 16621 . 2 (𝜑 → ((𝐼𝑋)(𝑋(Sect‘𝐶)𝑋)(𝐼𝑋) ↔ ((𝐼𝑋)(⟨𝑋, 𝑋⟩(comp‘𝐶)𝑋)(𝐼𝑋)) = (𝐼𝑋)))
118, 10mpbird 247 1 (𝜑 → (𝐼𝑋)(𝑋(Sect‘𝐶)𝑋)(𝐼𝑋))
Colors of variables: wff setvar class
Syntax hints:  wi 4   = wceq 1631  wcel 2145  cop 4323   class class class wbr 4787  cfv 6030  (class class class)co 6796  Basecbs 16064  Hom chom 16160  compcco 16161  Catccat 16532  Idccid 16533  Sectcsect 16611
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1870  ax-4 1885  ax-5 1991  ax-6 2057  ax-7 2093  ax-8 2147  ax-9 2154  ax-10 2174  ax-11 2190  ax-12 2203  ax-13 2408  ax-ext 2751  ax-rep 4905  ax-sep 4916  ax-nul 4924  ax-pow 4975  ax-pr 5035  ax-un 7100
This theorem depends on definitions:  df-bi 197  df-an 383  df-or 837  df-3an 1073  df-tru 1634  df-ex 1853  df-nf 1858  df-sb 2050  df-eu 2622  df-mo 2623  df-clab 2758  df-cleq 2764  df-clel 2767  df-nfc 2902  df-ne 2944  df-ral 3066  df-rex 3067  df-reu 3068  df-rmo 3069  df-rab 3070  df-v 3353  df-sbc 3588  df-csb 3683  df-dif 3726  df-un 3728  df-in 3730  df-ss 3737  df-nul 4064  df-if 4227  df-pw 4300  df-sn 4318  df-pr 4320  df-op 4324  df-uni 4576  df-iun 4657  df-br 4788  df-opab 4848  df-mpt 4865  df-id 5158  df-xp 5256  df-rel 5257  df-cnv 5258  df-co 5259  df-dm 5260  df-rn 5261  df-res 5262  df-ima 5263  df-iota 5993  df-fun 6032  df-fn 6033  df-f 6034  df-f1 6035  df-fo 6036  df-f1o 6037  df-fv 6038  df-riota 6757  df-ov 6799  df-oprab 6800  df-mpt2 6801  df-1st 7319  df-2nd 7320  df-cat 16536  df-cid 16537  df-sect 16614
This theorem is referenced by:  invid  16654
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