Theorem fthi 17882

Description: The morphism map of a faithful functor is an injection. (Contributed by Mario Carneiro, 27-Jan-2017.)

Hypotheses

Ref	Expression
isfth.b	⊢ 𝐵 = (Base‘𝐶)
isfth.h	⊢ 𝐻 = (Hom ‘𝐶)
isfth.j	⊢ 𝐽 = (Hom ‘𝐷)
fthf1.f	⊢ (𝜑 → 𝐹(𝐶 Faith 𝐷)𝐺)
fthf1.x	⊢ (𝜑 → 𝑋 ∈ 𝐵)
fthf1.y	⊢ (𝜑 → 𝑌 ∈ 𝐵)
fthi.r	⊢ (𝜑 → 𝑅 ∈ (𝑋𝐻𝑌))
fthi.s	⊢ (𝜑 → 𝑆 ∈ (𝑋𝐻𝑌))

Assertion

Ref	Expression
fthi	⊢ (𝜑 → (((𝑋𝐺𝑌)‘𝑅) = ((𝑋𝐺𝑌)‘𝑆) ↔ 𝑅 = 𝑆))

Proof of Theorem fthi

Step	Hyp	Ref	Expression
1		isfth.b	. . 3 ⊢ 𝐵 = (Base‘𝐶)
2		isfth.h	. . 3 ⊢ 𝐻 = (Hom ‘𝐶)
3		isfth.j	. . 3 ⊢ 𝐽 = (Hom ‘𝐷)
4		fthf1.f	. . 3 ⊢ (𝜑 → 𝐹(𝐶 Faith 𝐷)𝐺)
5		fthf1.x	. . 3 ⊢ (𝜑 → 𝑋 ∈ 𝐵)
6		fthf1.y	. . 3 ⊢ (𝜑 → 𝑌 ∈ 𝐵)
7	1, 2, 3, 4, 5, 6	fthf1 17881	. 2 ⊢ (𝜑 → (𝑋𝐺𝑌):(𝑋𝐻𝑌)–1-1→((𝐹‘𝑋)𝐽(𝐹‘𝑌)))
8		fthi.r	. 2 ⊢ (𝜑 → 𝑅 ∈ (𝑋𝐻𝑌))
9		fthi.s	. 2 ⊢ (𝜑 → 𝑆 ∈ (𝑋𝐻𝑌))
10		f1fveq 7212	. 2 ⊢ (((𝑋𝐺𝑌):(𝑋𝐻𝑌)–1-1→((𝐹‘𝑋)𝐽(𝐹‘𝑌)) ∧ (𝑅 ∈ (𝑋𝐻𝑌) ∧ 𝑆 ∈ (𝑋𝐻𝑌))) → (((𝑋𝐺𝑌)‘𝑅) = ((𝑋𝐺𝑌)‘𝑆) ↔ 𝑅 = 𝑆))
11	7, 8, 9, 10	syl12anc 837	1 ⊢ (𝜑 → (((𝑋𝐺𝑌)‘𝑅) = ((𝑋𝐺𝑌)‘𝑆) ↔ 𝑅 = 𝑆))

Syntax hints:   → wi 4   ↔ wb 206   = wceq 1542   ∈ wcel 2114   class class class wbr 5086  –1-1→wf1 6491  ‘cfv 6494  (class class class)co 7362  Basecbs 17174  Hom chom 17226   Faith cfth 17867

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1797  ax-4 1811  ax-5 1912  ax-6 1969  ax-7 2010  ax-8 2116  ax-9 2124  ax-10 2147  ax-11 2163  ax-12 2185  ax-ext 2709  ax-rep 5213  ax-sep 5232  ax-nul 5242  ax-pow 5304  ax-pr 5372  ax-un 7684

This theorem depends on definitions:  df-bi 207  df-an 396  df-or 849  df-3an 1089  df-tru 1545  df-fal 1555  df-ex 1782  df-nf 1786  df-sb 2069  df-mo 2540  df-eu 2570  df-clab 2716  df-cleq 2729  df-clel 2812  df-nfc 2886  df-ne 2934  df-ral 3053  df-rex 3063  df-rab 3391  df-v 3432  df-sbc 3730  df-csb 3839  df-dif 3893  df-un 3895  df-in 3897  df-ss 3907  df-nul 4275  df-if 4468  df-pw 4544  df-sn 4569  df-pr 4571  df-op 4575  df-uni 4852  df-iun 4936  df-br 5087  df-opab 5149  df-mpt 5168  df-id 5521  df-xp 5632  df-rel 5633  df-cnv 5634  df-co 5635  df-dm 5636  df-rn 5637  df-res 5638  df-ima 5639  df-iota 6450  df-fun 6496  df-fn 6497  df-f 6498  df-f1 6499  df-fv 6502  df-ov 7365  df-oprab 7366  df-mpo 7367  df-1st 7937  df-2nd 7938  df-map 8770  df-ixp 8841  df-func 17820  df-fth 17869

This theorem is referenced by:  fthsect  17889  fthmon  17891  fthcomf  49648