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Theorem f1cofveqaeq 6657
 Description: If the values of a composition of one-to-one functions for two arguments are equal, the arguments themselves must be equal. (Contributed by AV, 3-Feb-2021.)
Assertion
Ref Expression
f1cofveqaeq (((𝐹:𝐵1-1𝐶𝐺:𝐴1-1𝐵) ∧ (𝑋𝐴𝑌𝐴)) → ((𝐹‘(𝐺𝑋)) = (𝐹‘(𝐺𝑌)) → 𝑋 = 𝑌))

Proof of Theorem f1cofveqaeq
StepHypRef Expression
1 simpl 468 . . 3 ((𝐹:𝐵1-1𝐶𝐺:𝐴1-1𝐵) → 𝐹:𝐵1-1𝐶)
2 f1f 6241 . . . . . 6 (𝐺:𝐴1-1𝐵𝐺:𝐴𝐵)
3 ffvelrn 6500 . . . . . . . 8 ((𝐺:𝐴𝐵𝑋𝐴) → (𝐺𝑋) ∈ 𝐵)
43ex 397 . . . . . . 7 (𝐺:𝐴𝐵 → (𝑋𝐴 → (𝐺𝑋) ∈ 𝐵))
5 ffvelrn 6500 . . . . . . . 8 ((𝐺:𝐴𝐵𝑌𝐴) → (𝐺𝑌) ∈ 𝐵)
65ex 397 . . . . . . 7 (𝐺:𝐴𝐵 → (𝑌𝐴 → (𝐺𝑌) ∈ 𝐵))
74, 6anim12d 588 . . . . . 6 (𝐺:𝐴𝐵 → ((𝑋𝐴𝑌𝐴) → ((𝐺𝑋) ∈ 𝐵 ∧ (𝐺𝑌) ∈ 𝐵)))
82, 7syl 17 . . . . 5 (𝐺:𝐴1-1𝐵 → ((𝑋𝐴𝑌𝐴) → ((𝐺𝑋) ∈ 𝐵 ∧ (𝐺𝑌) ∈ 𝐵)))
98adantl 467 . . . 4 ((𝐹:𝐵1-1𝐶𝐺:𝐴1-1𝐵) → ((𝑋𝐴𝑌𝐴) → ((𝐺𝑋) ∈ 𝐵 ∧ (𝐺𝑌) ∈ 𝐵)))
109imp 393 . . 3 (((𝐹:𝐵1-1𝐶𝐺:𝐴1-1𝐵) ∧ (𝑋𝐴𝑌𝐴)) → ((𝐺𝑋) ∈ 𝐵 ∧ (𝐺𝑌) ∈ 𝐵))
11 f1veqaeq 6656 . . 3 ((𝐹:𝐵1-1𝐶 ∧ ((𝐺𝑋) ∈ 𝐵 ∧ (𝐺𝑌) ∈ 𝐵)) → ((𝐹‘(𝐺𝑋)) = (𝐹‘(𝐺𝑌)) → (𝐺𝑋) = (𝐺𝑌)))
121, 10, 11syl2an2r 656 . 2 (((𝐹:𝐵1-1𝐶𝐺:𝐴1-1𝐵) ∧ (𝑋𝐴𝑌𝐴)) → ((𝐹‘(𝐺𝑋)) = (𝐹‘(𝐺𝑌)) → (𝐺𝑋) = (𝐺𝑌)))
13 f1veqaeq 6656 . . 3 ((𝐺:𝐴1-1𝐵 ∧ (𝑋𝐴𝑌𝐴)) → ((𝐺𝑋) = (𝐺𝑌) → 𝑋 = 𝑌))
1413adantll 685 . 2 (((𝐹:𝐵1-1𝐶𝐺:𝐴1-1𝐵) ∧ (𝑋𝐴𝑌𝐴)) → ((𝐺𝑋) = (𝐺𝑌) → 𝑋 = 𝑌))
1512, 14syld 47 1 (((𝐹:𝐵1-1𝐶𝐺:𝐴1-1𝐵) ∧ (𝑋𝐴𝑌𝐴)) → ((𝐹‘(𝐺𝑋)) = (𝐹‘(𝐺𝑌)) → 𝑋 = 𝑌))
 Colors of variables: wff setvar class Syntax hints:   → wi 4   ∧ wa 382   = wceq 1630   ∈ wcel 2144  ⟶wf 6027  –1-1→wf1 6028  ‘cfv 6031 This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1869  ax-4 1884  ax-5 1990  ax-6 2056  ax-7 2092  ax-9 2153  ax-10 2173  ax-11 2189  ax-12 2202  ax-13 2407  ax-ext 2750  ax-sep 4912  ax-nul 4920  ax-pr 5034 This theorem depends on definitions:  df-bi 197  df-an 383  df-or 827  df-3an 1072  df-tru 1633  df-ex 1852  df-nf 1857  df-sb 2049  df-eu 2621  df-mo 2622  df-clab 2757  df-cleq 2763  df-clel 2766  df-nfc 2901  df-ral 3065  df-rex 3066  df-rab 3069  df-v 3351  df-sbc 3586  df-dif 3724  df-un 3726  df-in 3728  df-ss 3735  df-nul 4062  df-if 4224  df-sn 4315  df-pr 4317  df-op 4321  df-uni 4573  df-br 4785  df-opab 4845  df-id 5157  df-xp 5255  df-rel 5256  df-cnv 5257  df-co 5258  df-dm 5259  df-rn 5260  df-iota 5994  df-fun 6033  df-fn 6034  df-f 6035  df-f1 6036  df-fv 6039 This theorem is referenced by:  uspgrn2crct  26935
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