| Mathbox for Zhi Wang |
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| Mirrors > Home > MPE Home > Th. List > Mathboxes > setcsnterm | Structured version Visualization version GIF version | ||
| Description: The category of one set, either a singleton set or an empty set, is terminal. (Contributed by Zhi Wang, 18-Oct-2025.) |
| Ref | Expression |
|---|---|
| setcsnterm | ⊢ (SetCat‘{{𝐴}}) ∈ TermCat |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | eqidd 2764 | . . . 4 ⊢ (⊤ → (SetCat‘{{𝐴}}) = (SetCat‘{{𝐴}})) | |
| 2 | snex 5404 | . . . . 5 ⊢ {{𝐴}} ∈ V | |
| 3 | 2 | a1i 11 | . . . 4 ⊢ (⊤ → {{𝐴}} ∈ V) |
| 4 | velsn 4600 | . . . . . . 7 ⊢ (𝑥 ∈ {{𝐴}} ↔ 𝑥 = {𝐴}) | |
| 5 | mosn 50255 | . . . . . . 7 ⊢ (𝑥 = {𝐴} → ∃*𝑝 𝑝 ∈ 𝑥) | |
| 6 | 4, 5 | sylbi 220 | . . . . . 6 ⊢ (𝑥 ∈ {{𝐴}} → ∃*𝑝 𝑝 ∈ 𝑥) |
| 7 | 6 | rgen 3082 | . . . . 5 ⊢ ∀𝑥 ∈ {{𝐴}}∃*𝑝 𝑝 ∈ 𝑥 |
| 8 | 7 | a1i 11 | . . . 4 ⊢ (⊤ → ∀𝑥 ∈ {{𝐴}}∃*𝑝 𝑝 ∈ 𝑥) |
| 9 | 1, 3, 8 | setcthin 50931 | . . 3 ⊢ (⊤ → (SetCat‘{{𝐴}}) ∈ ThinCat) |
| 10 | 9 | mptru 1577 | . 2 ⊢ (SetCat‘{{𝐴}}) ∈ ThinCat |
| 11 | snex 5404 | . . 3 ⊢ {𝐴} ∈ V | |
| 12 | 11 | ensn1 9086 | . 2 ⊢ {{𝐴}} ≈ 1o |
| 13 | eqid 2763 | . . . . 5 ⊢ (SetCat‘{{𝐴}}) = (SetCat‘{{𝐴}}) | |
| 14 | 13, 3 | setcbas 18303 | . . . 4 ⊢ (⊤ → {{𝐴}} = (Base‘(SetCat‘{{𝐴}}))) |
| 15 | 14 | mptru 1577 | . . 3 ⊢ {{𝐴}} = (Base‘(SetCat‘{{𝐴}})) |
| 16 | 15 | istermc3 50942 | . 2 ⊢ ((SetCat‘{{𝐴}}) ∈ TermCat ↔ ((SetCat‘{{𝐴}}) ∈ ThinCat ∧ {{𝐴}} ≈ 1o)) |
| 17 | 10, 12, 16 | mpbir2an 724 | 1 ⊢ (SetCat‘{{𝐴}}) ∈ TermCat |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: = wceq 1570 ⊤wtru 1571 ∈ wcel 2147 ∃*wmo 2565 ∀wral 3080 Vcvv 3454 {csn 4588 class class class wbr 5108 ‘cfv 6566 1oc1o 8507 ≈ cen 9008 Basecbs 17431 SetCatcsetc 18300 ThinCatcthinc 50883 TermCatctermc 50938 |
| 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 1945 ax-6 2002 ax-7 2043 ax-8 2149 ax-9 2157 ax-10 2180 ax-11 2197 ax-12 2216 ax-ext 2735 ax-rep 5238 ax-sep 5255 ax-nul 5266 ax-pow 5334 ax-pr 5398 ax-un 7783 ax-cnex 11295 ax-resscn 11296 ax-1cn 11297 ax-icn 11298 ax-addcl 11299 ax-addrcl 11300 ax-mulcl 11301 ax-mulrcl 11302 ax-mulcom 11303 ax-addass 11304 ax-mulass 11305 ax-distr 11306 ax-i2m1 11307 ax-1ne0 11308 ax-1rid 11309 ax-rnegex 11310 ax-rrecex 11311 ax-cnre 11312 ax-pre-lttri 11313 ax-pre-lttrn 11314 ax-pre-ltadd 11315 ax-pre-mulgt0 11316 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3or 1104 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1813 df-nf 1817 df-sb 2102 df-mo 2567 df-eu 2597 df-clab 2742 df-cleq 2755 df-clel 2839 df-nfc 2913 df-ne 2960 df-nel 3066 df-ral 3081 df-rex 3091 df-rmo 3369 df-reu 3370 df-rab 3417 df-v 3456 df-sbc 3743 df-csb 3852 df-ss 3901 df-pss 4017 df-dif 4050 df-in 4094 df-un 4154 df-nul 4282 df-if 4486 df-pw 4562 df-sn 4589 df-pr 4591 df-tp 4593 df-op 4841 df-uni 4873 df-iun 4958 df-br 5109 df-opab 5174 df-mpt 5193 df-tr 5219 df-id 5553 df-eprel 5558 df-po 5566 df-so 5567 df-fr 5611 df-we 5613 df-xp 5664 df-rel 5665 df-cnv 5666 df-co 5667 df-dm 5668 df-rn 5669 df-res 5670 df-ima 5671 df-pred 6330 df-ord 6391 df-on 6392 df-lim 6393 df-suc 6394 df-iota 6520 df-fun 6568 df-fn 6569 df-f 6570 df-f1 6571 df-fo 6572 df-f1o 6573 df-fv 6574 df-riota 7408 df-ov 7454 df-oprab 7455 df-mpo 7456 df-om 7912 df-1st 8035 df-2nd 8036 df-frecs 8337 df-wrecs 8368 df-recs 8417 df-rdg 8456 df-1o 8514 df-er 8755 df-map 8887 df-en 9012 df-dom 9013 df-sdom 9014 df-fin 9015 df-pnf 11384 df-mnf 11385 df-xr 11386 df-ltxr 11387 df-le 11388 df-sub 11582 df-neg 11583 df-nn 12376 df-2 12445 df-3 12446 df-4 12447 df-5 12448 df-6 12449 df-7 12450 df-8 12451 df-9 12452 df-n0 12647 df-z 12734 df-dec 12855 df-uz 13006 df-fz 13680 df-struct 17369 df-slot 17404 df-ndx 17416 df-base 17432 df-hom 17497 df-cco 17498 df-cat 17892 df-cid 17893 df-setc 18301 df-thinc 50884 df-termc 50939 |
| This theorem is used by: setc1oterm 50957 |
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