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| Mirrors > Home > MPE Home > Th. List > Mathboxes > dftermc3 | Structured version Visualization version GIF version | ||
| Description: Alternate definition of TermCat. See also df-termc 50503, dftermc2 50550. (Contributed by Zhi Wang, 20-Oct-2025.) |
| Ref | Expression |
|---|---|
| dftermc3 | ⊢ TermCat = {𝑐 ∣ (Arrow‘𝑐) ≈ 1o} |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | termcarweu 50558 | . . . 4 ⊢ (𝑐 ∈ TermCat → ∃!𝑎 𝑎 ∈ (Arrow‘𝑐)) | |
| 2 | arweutermc 50560 | . . . 4 ⊢ (∃!𝑎 𝑎 ∈ (Arrow‘𝑐) → 𝑐 ∈ TermCat) | |
| 3 | 1, 2 | impbii 212 | . . 3 ⊢ (𝑐 ∈ TermCat ↔ ∃!𝑎 𝑎 ∈ (Arrow‘𝑐)) |
| 4 | euen1b 9033 | . . 3 ⊢ ((Arrow‘𝑐) ≈ 1o ↔ ∃!𝑎 𝑎 ∈ (Arrow‘𝑐)) | |
| 5 | 3, 4 | bitr4i 281 | . 2 ⊢ (𝑐 ∈ TermCat ↔ (Arrow‘𝑐) ≈ 1o) |
| 6 | 5 | eqabi 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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