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Theorem dftermc3 49277
Description: Alternate definition of TermCat. See also df-termc 49220, dftermc2 49266. (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 49274 . . . 4 (𝑐 ∈ TermCat → ∃!𝑎 𝑎 ∈ (Arrow‘𝑐))
2 arweutermc 49276 . . . 4 (∃!𝑎 𝑎 ∈ (Arrow‘𝑐) → 𝑐 ∈ TermCat)
31, 2impbii 209 . . 3 (𝑐 ∈ TermCat ↔ ∃!𝑎 𝑎 ∈ (Arrow‘𝑐))
4 euen1b 9037 . . 3 ((Arrow‘𝑐) ≈ 1o ↔ ∃!𝑎 𝑎 ∈ (Arrow‘𝑐))
53, 4bitr4i 278 . 2 (𝑐 ∈ TermCat ↔ (Arrow‘𝑐) ≈ 1o)
65eqabi 2869 1 TermCat = {𝑐 ∣ (Arrow‘𝑐) ≈ 1o}
Colors of variables: wff setvar class
Syntax hints:   = wceq 1539  wcel 2107  ∃!weu 2566  {cab 2712   class class class wbr 5117  cfv 6528  1oc1o 8468  cen 8951  Arrowcarw 18022  TermCatctermc 49219
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1794  ax-4 1808  ax-5 1909  ax-6 1966  ax-7 2006  ax-8 2109  ax-9 2117  ax-10 2140  ax-11 2156  ax-12 2176  ax-ext 2706  ax-rep 5247  ax-sep 5264  ax-nul 5274  ax-pow 5333  ax-pr 5400  ax-un 7724
This theorem depends on definitions:  df-bi 207  df-an 396  df-or 848  df-3an 1088  df-tru 1542  df-fal 1552  df-ex 1779  df-nf 1783  df-sb 2064  df-mo 2538  df-eu 2567  df-clab 2713  df-cleq 2726  df-clel 2808  df-nfc 2884  df-ne 2932  df-ral 3051  df-rex 3060  df-rmo 3357  df-reu 3358  df-rab 3414  df-v 3459  df-sbc 3764  df-csb 3873  df-dif 3927  df-un 3929  df-in 3931  df-ss 3941  df-nul 4307  df-if 4499  df-pw 4575  df-sn 4600  df-pr 4602  df-op 4606  df-ot 4608  df-uni 4882  df-iun 4967  df-br 5118  df-opab 5180  df-mpt 5200  df-id 5546  df-xp 5658  df-rel 5659  df-cnv 5660  df-co 5661  df-dm 5662  df-rn 5663  df-res 5664  df-ima 5665  df-suc 6356  df-iota 6481  df-fun 6530  df-fn 6531  df-f 6532  df-f1 6533  df-fo 6534  df-f1o 6535  df-fv 6536  df-riota 7357  df-ov 7403  df-1st 7983  df-2nd 7984  df-1o 8475  df-en 8955  df-cat 17667  df-cid 17668  df-doma 18024  df-coda 18025  df-homa 18026  df-arw 18027  df-thinc 49167  df-termc 49220
This theorem is referenced by: (None)
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