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Theorem dftermc3 49637
Description: Alternate definition of TermCat. See also df-termc 49579, dftermc2 49626. (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 49634 . . . 4 (𝑐 ∈ TermCat → ∃!𝑎 𝑎 ∈ (Arrow‘𝑐))
2 arweutermc 49636 . . . 4 (∃!𝑎 𝑎 ∈ (Arrow‘𝑐) → 𝑐 ∈ TermCat)
31, 2impbii 209 . . 3 (𝑐 ∈ TermCat ↔ ∃!𝑎 𝑎 ∈ (Arrow‘𝑐))
4 euen1b 8956 . . 3 ((Arrow‘𝑐) ≈ 1o ↔ ∃!𝑎 𝑎 ∈ (Arrow‘𝑐))
53, 4bitr4i 278 . 2 (𝑐 ∈ TermCat ↔ (Arrow‘𝑐) ≈ 1o)
65eqabi 2866 1 TermCat = {𝑐 ∣ (Arrow‘𝑐) ≈ 1o}
Colors of variables: wff setvar class
Syntax hints:   = wceq 1541  wcel 2111  ∃!weu 2563  {cab 2709   class class class wbr 5093  cfv 6487  1oc1o 8384  cen 8872  Arrowcarw 17935  TermCatctermc 49578
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1796  ax-4 1810  ax-5 1911  ax-6 1968  ax-7 2009  ax-8 2113  ax-9 2121  ax-10 2144  ax-11 2160  ax-12 2180  ax-ext 2703  ax-rep 5219  ax-sep 5236  ax-nul 5246  ax-pow 5305  ax-pr 5372  ax-un 7674
This theorem depends on definitions:  df-bi 207  df-an 396  df-or 848  df-3an 1088  df-tru 1544  df-fal 1554  df-ex 1781  df-nf 1785  df-sb 2068  df-mo 2535  df-eu 2564  df-clab 2710  df-cleq 2723  df-clel 2806  df-nfc 2881  df-ne 2929  df-ral 3048  df-rex 3057  df-rmo 3346  df-reu 3347  df-rab 3396  df-v 3438  df-sbc 3737  df-csb 3846  df-dif 3900  df-un 3902  df-in 3904  df-ss 3914  df-nul 4283  df-if 4475  df-pw 4551  df-sn 4576  df-pr 4578  df-op 4582  df-ot 4584  df-uni 4859  df-iun 4943  df-br 5094  df-opab 5156  df-mpt 5175  df-id 5514  df-xp 5625  df-rel 5626  df-cnv 5627  df-co 5628  df-dm 5629  df-rn 5630  df-res 5631  df-ima 5632  df-suc 6318  df-iota 6443  df-fun 6489  df-fn 6490  df-f 6491  df-f1 6492  df-fo 6493  df-f1o 6494  df-fv 6495  df-riota 7309  df-ov 7355  df-1st 7927  df-2nd 7928  df-1o 8391  df-en 8876  df-cat 17580  df-cid 17581  df-doma 17937  df-coda 17938  df-homa 17939  df-arw 17940  df-thinc 49524  df-termc 49579
This theorem is referenced by: (None)
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