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Theorem dftermc3 50561
Description: Alternate definition of TermCat. See also df-termc 50503, dftermc2 50550. (Contributed by Zhi Wang, 20-Oct-2025.)
Assertion
Ref Expression
dftermc3 TermCat = {𝑐 ∣ (Arrow‘𝑐) ≈ 1o}

Proof of Theorem dftermc3
Dummy variable 𝑎 is distinct from all other variables.
StepHypRef Expression
1 termcarweu 50558 . . . 4 (𝑐 ∈ TermCat → ∃!𝑎 𝑎 ∈ (Arrow‘𝑐))
2 arweutermc 50560 . . . 4 (∃!𝑎 𝑎 ∈ (Arrow‘𝑐) → 𝑐 ∈ TermCat)
31, 2impbii 212 . . 3 (𝑐 ∈ TermCat ↔ ∃!𝑎 𝑎 ∈ (Arrow‘𝑐))
4 euen1b 9033 . . 3 ((Arrow‘𝑐) ≈ 1o ↔ ∃!𝑎 𝑎 ∈ (Arrow‘𝑐))
53, 4bitr4i 281 . 2 (𝑐 ∈ TermCat ↔ (Arrow‘𝑐) ≈ 1o)
65eqabi 2895 1 TermCat = {𝑐 ∣ (Arrow‘𝑐) ≈ 1o}
Colors of variables:    wff setvar class
This proof depends on syntax axioms:   = wceq 1570   ∈ wcel 2145  ∃!weu 2593  {cab 2738   class class class wbr 5102  ‘cfv 6527  1oc1o 8447   ≈ cen 8948  Arrowcarw 18158  TermCatctermc 50502
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 2213  ax-ext 2732  ax-rep 5231  ax-sep 5248  ax-nul 5259  ax-pow 5326  ax-pr 5390  ax-un 7734
This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3an 1105  df-tru 1573  df-fal 1583  df-ex 1813  df-nf 1817  df-sb 2100  df-mo 2564  df-eu 2594  df-clab 2739  df-cleq 2752  df-clel 2835  df-nfc 2909  df-ne 2956  df-ral 3077  df-rex 3087  df-rmo 3365  df-reu 3366  df-rab 3413  df-v 3452  df-sbc 3739  df-csb 3847  df-dif 3901  df-un 3903  df-in 3905  df-ss 3915  df-nul 4279  df-if 4482  df-pw 4558  df-sn 4584  df-pr 4586  df-op 4590  df-ot 4592  df-uni 4867  df-iun 4952  df-br 5103  df-opab 5167  df-mpt 5186  df-id 5542  df-xp 5653  df-rel 5654  df-cnv 5655  df-co 5656  df-dm 5657  df-rn 5658  df-res 5659  df-ima 5660  df-suc 6357  df-iota 6483  df-fun 6529  df-fn 6530  df-f 6531  df-f1 6532  df-fo 6533  df-f1o 6534  df-fv 6535  df-riota 7365  df-ov 7411  df-1st 7984  df-2nd 7985  df-1o 8454  df-en 8952  df-cat 17803  df-cid 17804  df-doma 18160  df-coda 18161  df-homa 18162  df-arw 18163  df-thinc 50448  df-termc 50503
This theorem is used by: (None)
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