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Theorem dftermc3 49964
Description: Alternate definition of TermCat. See also df-termc 49906, dftermc2 49953. (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 49961 . . . 4 (𝑐 ∈ TermCat → ∃!𝑎 𝑎 ∈ (Arrow‘𝑐))
2 arweutermc 49963 . . . 4 (∃!𝑎 𝑎 ∈ (Arrow‘𝑐) → 𝑐 ∈ TermCat)
31, 2impbii 209 . . 3 (𝑐 ∈ TermCat ↔ ∃!𝑎 𝑎 ∈ (Arrow‘𝑐))
4 euen1b 8966 . . 3 ((Arrow‘𝑐) ≈ 1o ↔ ∃!𝑎 𝑎 ∈ (Arrow‘𝑐))
53, 4bitr4i 278 . 2 (𝑐 ∈ TermCat ↔ (Arrow‘𝑐) ≈ 1o)
65eqabi 2872 1 TermCat = {𝑐 ∣ (Arrow‘𝑐) ≈ 1o}
Colors of variables: wff setvar class
Syntax hints:   = wceq 1542  wcel 2114  ∃!weu 2569  {cab 2715   class class class wbr 5086  cfv 6490  1oc1o 8389  cen 8881  Arrowcarw 17947  TermCatctermc 49905
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1797  ax-4 1811  ax-5 1912  ax-6 1969  ax-7 2010  ax-8 2116  ax-9 2124  ax-10 2147  ax-11 2163  ax-12 2185  ax-ext 2709  ax-rep 5212  ax-sep 5231  ax-nul 5241  ax-pow 5300  ax-pr 5368  ax-un 7680
This theorem depends on definitions:  df-bi 207  df-an 396  df-or 849  df-3an 1089  df-tru 1545  df-fal 1555  df-ex 1782  df-nf 1786  df-sb 2069  df-mo 2540  df-eu 2570  df-clab 2716  df-cleq 2729  df-clel 2812  df-nfc 2886  df-ne 2934  df-ral 3053  df-rex 3063  df-rmo 3343  df-reu 3344  df-rab 3391  df-v 3432  df-sbc 3730  df-csb 3839  df-dif 3893  df-un 3895  df-in 3897  df-ss 3907  df-nul 4275  df-if 4468  df-pw 4544  df-sn 4569  df-pr 4571  df-op 4575  df-ot 4577  df-uni 4852  df-iun 4936  df-br 5087  df-opab 5149  df-mpt 5168  df-id 5517  df-xp 5628  df-rel 5629  df-cnv 5630  df-co 5631  df-dm 5632  df-rn 5633  df-res 5634  df-ima 5635  df-suc 6321  df-iota 6446  df-fun 6492  df-fn 6493  df-f 6494  df-f1 6495  df-fo 6496  df-f1o 6497  df-fv 6498  df-riota 7315  df-ov 7361  df-1st 7933  df-2nd 7934  df-1o 8396  df-en 8885  df-cat 17592  df-cid 17593  df-doma 17949  df-coda 17950  df-homa 17951  df-arw 17952  df-thinc 49851  df-termc 49906
This theorem is referenced by: (None)
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