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Theorem oppff1o 50083
Description: The operation generating opposite functors is bijective. (Contributed by Zhi Wang, 17-Nov-2025.)
Hypotheses
Ref Expression
oppff1.o 𝑂 = (oppCat‘𝐶)
oppff1.p 𝑃 = (oppCat‘𝐷)
oppff1o.c (𝜑𝐶𝑉)
oppff1o.d (𝜑𝐷𝑊)
Assertion
Ref Expression
oppff1o (𝜑 → ( oppFunc ↾ (𝐶 Func 𝐷)):(𝐶 Func 𝐷)–1-1-onto→(𝑂 Func 𝑃))

Proof of Theorem oppff1o
Dummy variables 𝑓 𝑔 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 oppff1.o . . . 4 𝑂 = (oppCat‘𝐶)
2 oppff1.p . . . 4 𝑃 = (oppCat‘𝐷)
31, 2oppff1 50082 . . 3 ( oppFunc ↾ (𝐶 Func 𝐷)):(𝐶 Func 𝐷)–1-1→(𝑂 Func 𝑃)
43a1i 11 . 2 (𝜑 → ( oppFunc ↾ (𝐶 Func 𝐷)):(𝐶 Func 𝐷)–1-1→(𝑂 Func 𝑃))
5 f1f 6775 . . . 4 (( oppFunc ↾ (𝐶 Func 𝐷)):(𝐶 Func 𝐷)–1-1→(𝑂 Func 𝑃) → ( oppFunc ↾ (𝐶 Func 𝐷)):(𝐶 Func 𝐷)⟶(𝑂 Func 𝑃))
64, 5syl 18 . . 3 (𝜑 → ( oppFunc ↾ (𝐶 Func 𝐷)):(𝐶 Func 𝐷)⟶(𝑂 Func 𝑃))
7 fveq2 6882 . . . . . 6 (𝑔 = ( oppFunc ‘𝑓) → (( oppFunc ↾ (𝐶 Func 𝐷))‘𝑔) = (( oppFunc ↾ (𝐶 Func 𝐷))‘( oppFunc ‘𝑓)))
87eqeq2d 2773 . . . . 5 (𝑔 = ( oppFunc ‘𝑓) → (𝑓 = (( oppFunc ↾ (𝐶 Func 𝐷))‘𝑔) ↔ 𝑓 = (( oppFunc ↾ (𝐶 Func 𝐷))‘( oppFunc ‘𝑓))))
9 oppff1o.c . . . . . . 7 (𝜑𝐶𝑉)
109adantr 486 . . . . . 6 ((𝜑𝑓 ∈ (𝑂 Func 𝑃)) → 𝐶𝑉)
11 oppff1o.d . . . . . . 7 (𝜑𝐷𝑊)
1211adantr 486 . . . . . 6 ((𝜑𝑓 ∈ (𝑂 Func 𝑃)) → 𝐷𝑊)
13 simpr 490 . . . . . 6 ((𝜑𝑓 ∈ (𝑂 Func 𝑃)) → 𝑓 ∈ (𝑂 Func 𝑃))
141, 2, 10, 12, 132oppffunc 50080 . . . . 5 ((𝜑𝑓 ∈ (𝑂 Func 𝑃)) → ( oppFunc ‘𝑓) ∈ (𝐶 Func 𝐷))
1514fvresd 6902 . . . . . 6 ((𝜑𝑓 ∈ (𝑂 Func 𝑃)) → (( oppFunc ↾ (𝐶 Func 𝐷))‘( oppFunc ‘𝑓)) = ( oppFunc ‘( oppFunc ‘𝑓)))
16 relfunc 17957 . . . . . . 7 Rel (𝐶 Func 𝐷)
17 eqid 2762 . . . . . . 7 ( oppFunc ‘𝑓) = ( oppFunc ‘𝑓)
1814, 16, 172oppf 50066 . . . . . 6 ((𝜑𝑓 ∈ (𝑂 Func 𝑃)) → ( oppFunc ‘( oppFunc ‘𝑓)) = 𝑓)
1915, 18eqtr2d 2798 . . . . 5 ((𝜑𝑓 ∈ (𝑂 Func 𝑃)) → 𝑓 = (( oppFunc ↾ (𝐶 Func 𝐷))‘( oppFunc ‘𝑓)))
208, 14, 19rspcedvdw 3582 . . . 4 ((𝜑𝑓 ∈ (𝑂 Func 𝑃)) → ∃𝑔 ∈ (𝐶 Func 𝐷)𝑓 = (( oppFunc ↾ (𝐶 Func 𝐷))‘𝑔))
2120ralrimiva 3156 . . 3 (𝜑 → ∀𝑓 ∈ (𝑂 Func 𝑃)∃𝑔 ∈ (𝐶 Func 𝐷)𝑓 = (( oppFunc ↾ (𝐶 Func 𝐷))‘𝑔))
22 dffo3 7099 . . 3 (( oppFunc ↾ (𝐶 Func 𝐷)):(𝐶 Func 𝐷)–onto→(𝑂 Func 𝑃) ↔ (( oppFunc ↾ (𝐶 Func 𝐷)):(𝐶 Func 𝐷)⟶(𝑂 Func 𝑃) ∧ ∀𝑓 ∈ (𝑂 Func 𝑃)∃𝑔 ∈ (𝐶 Func 𝐷)𝑓 = (( oppFunc ↾ (𝐶 Func 𝐷))‘𝑔)))
236, 21, 22sylanbrc 595 . 2 (𝜑 → ( oppFunc ↾ (𝐶 Func 𝐷)):(𝐶 Func 𝐷)–onto→(𝑂 Func 𝑃))
24 df-f1o 6544 . 2 (( oppFunc ↾ (𝐶 Func 𝐷)):(𝐶 Func 𝐷)–1-1-onto→(𝑂 Func 𝑃) ↔ (( oppFunc ↾ (𝐶 Func 𝐷)):(𝐶 Func 𝐷)–1-1→(𝑂 Func 𝑃) ∧ ( oppFunc ↾ (𝐶 Func 𝐷)):(𝐶 Func 𝐷)–onto→(𝑂 Func 𝑃)))
254, 23, 24sylanbrc 595 1 (𝜑 → ( oppFunc ↾ (𝐶 Func 𝐷)):(𝐶 Func 𝐷)–1-1-onto→(𝑂 Func 𝑃))
Colors of variables:    wff setvar class
This proof depends on syntax axioms:  wi 4  wa 401   = wceq 1570  wcel 2145  wral 3078  wrex 3088  cres 5661  wf 6533  1-1wf1 6534  ontowfo 6535  1-1-ontowf1o 6536  cfv 6537  (class class class)co 7417  oppCatcoppc 17805   Func cfunc 17949   oppFunc coppf 50056
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1828  ax-4 1842  ax-5 1943  ax-6 2000  ax-7 2041  ax-8 2147  ax-9 2155  ax-10 2178  ax-11 2194  ax-12 2215  ax-ext 2734  ax-rep 5236  ax-sep 5255  ax-nul 5267  ax-pow 5334  ax-pr 5402  ax-un 7740  ax-cnex 11184  ax-resscn 11185  ax-1cn 11186  ax-icn 11187  ax-addcl 11188  ax-addrcl 11189  ax-mulcl 11190  ax-mulrcl 11191  ax-mulcom 11192  ax-addass 11193  ax-mulass 11194  ax-distr 11195  ax-i2m1 11196  ax-1ne0 11197  ax-1rid 11198  ax-rnegex 11199  ax-rrecex 11200  ax-cnre 11201  ax-pre-lttri 11202  ax-pre-lttrn 11203  ax-pre-ltadd 11204  ax-pre-mulgt0 11205
This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3or 1104  df-3an 1105  df-tru 1573  df-fal 1583  df-ex 1813  df-nf 1817  df-sb 2100  df-mo 2566  df-eu 2596  df-clab 2741  df-cleq 2754  df-clel 2837  df-nfc 2911  df-ne 2958  df-nel 3064  df-ral 3079  df-rex 3089  df-rmo 3367  df-reu 3368  df-rab 3415  df-v 3455  df-sbc 3743  df-csb 3851  df-dif 3905  df-un 3907  df-in 3909  df-ss 3919  df-pss 3922  df-nul 4283  df-if 4486  df-pw 4562  df-sn 4588  df-pr 4590  df-op 4594  df-uni 4871  df-iun 4956  df-br 5108  df-opab 5172  df-mpt 5191  df-tr 5217  df-id 5554  df-eprel 5559  df-po 5567  df-so 5568  df-fr 5612  df-we 5614  df-xp 5665  df-rel 5666  df-cnv 5667  df-co 5668  df-dm 5669  df-rn 5670  df-res 5671  df-ima 5672  df-pred 6303  df-ord 6364  df-on 6365  df-lim 6366  df-suc 6367  df-iota 6493  df-fun 6539  df-fn 6540  df-f 6541  df-f1 6542  df-fo 6543  df-f1o 6544  df-fv 6545  df-riota 7374  df-ov 7420  df-oprab 7421  df-mpo 7422  df-om 7867  df-1st 7990  df-2nd 7991  df-tpos 8228  df-frecs 8284  df-wrecs 8315  df-recs 8364  df-rdg 8403  df-er 8700  df-map 8832  df-ixp 8909  df-en 8957  df-dom 8958  df-sdom 8959  df-pnf 11273  df-mnf 11274  df-xr 11275  df-ltxr 11276  df-le 11277  df-sub 11471  df-neg 11472  df-nn 12262  df-2 12331  df-3 12332  df-4 12333  df-5 12334  df-6 12335  df-7 12336  df-8 12337  df-9 12338  df-n0 12533  df-z 12620  df-dec 12741  df-sets 17262  df-slot 17280  df-ndx 17292  df-base 17308  df-hom 17372  df-cco 17373  df-cat 17762  df-cid 17763  df-homf 17764  df-comf 17765  df-oppc 17806  df-func 17953  df-oppf 50057
This theorem is used by:  fucoppc  50344
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