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| Mirrors > Home > MPE Home > Th. List > setc2ohom | Structured version Visualization version GIF version | ||
| Description: (SetCat‘2o) is a category (provable from setccat 18052 and 2oex 8416) that does not have pairwise disjoint hom-sets, proved by this theorem combined with setc2obas 18061. Notably, the empty set ∅ is simultaneously an object (setc2obas 18061), an identity morphism from ∅ to ∅ (setcid 18053 or thincid 49907), and a non-identity morphism from ∅ to 1o. See cat1lem 18063 and cat1 18064 for a more general statement. This category is also thin (setc2othin 49941), and therefore is "equivalent" to a preorder (actually a partial order). See prsthinc 49939 for more details on the "equivalence". (Contributed by Zhi Wang, 24-Sep-2024.) |
| Ref | Expression |
|---|---|
| setc2ohom.c | ⊢ 𝐶 = (SetCat‘2o) |
| setc2ohom.h | ⊢ 𝐻 = (Hom ‘𝐶) |
| Ref | Expression |
|---|---|
| setc2ohom | ⊢ ∅ ∈ ((∅𝐻∅) ∩ (∅𝐻1o)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | f0 6721 | . . 3 ⊢ ∅:∅⟶∅ | |
| 2 | setc2ohom.c | . . . . 5 ⊢ 𝐶 = (SetCat‘2o) | |
| 3 | 2oex 8416 | . . . . . 6 ⊢ 2o ∈ V | |
| 4 | 3 | a1i 11 | . . . . 5 ⊢ (⊤ → 2o ∈ V) |
| 5 | setc2ohom.h | . . . . 5 ⊢ 𝐻 = (Hom ‘𝐶) | |
| 6 | 0ex 5242 | . . . . . . . 8 ⊢ ∅ ∈ V | |
| 7 | 6 | prid1 4706 | . . . . . . 7 ⊢ ∅ ∈ {∅, 1o} |
| 8 | df2o3 8413 | . . . . . . 7 ⊢ 2o = {∅, 1o} | |
| 9 | 7, 8 | eleqtrri 2835 | . . . . . 6 ⊢ ∅ ∈ 2o |
| 10 | 9 | a1i 11 | . . . . 5 ⊢ (⊤ → ∅ ∈ 2o) |
| 11 | 2, 4, 5, 10, 10 | elsetchom 18048 | . . . 4 ⊢ (⊤ → (∅ ∈ (∅𝐻∅) ↔ ∅:∅⟶∅)) |
| 12 | 11 | mptru 1549 | . . 3 ⊢ (∅ ∈ (∅𝐻∅) ↔ ∅:∅⟶∅) |
| 13 | 1, 12 | mpbir 231 | . 2 ⊢ ∅ ∈ (∅𝐻∅) |
| 14 | f0 6721 | . . 3 ⊢ ∅:∅⟶1o | |
| 15 | 1oex 8415 | . . . . . . . 8 ⊢ 1o ∈ V | |
| 16 | 15 | prid2 4707 | . . . . . . 7 ⊢ 1o ∈ {∅, 1o} |
| 17 | 16, 8 | eleqtrri 2835 | . . . . . 6 ⊢ 1o ∈ 2o |
| 18 | 17 | a1i 11 | . . . . 5 ⊢ (⊤ → 1o ∈ 2o) |
| 19 | 2, 4, 5, 10, 18 | elsetchom 18048 | . . . 4 ⊢ (⊤ → (∅ ∈ (∅𝐻1o) ↔ ∅:∅⟶1o)) |
| 20 | 19 | mptru 1549 | . . 3 ⊢ (∅ ∈ (∅𝐻1o) ↔ ∅:∅⟶1o) |
| 21 | 14, 20 | mpbir 231 | . 2 ⊢ ∅ ∈ (∅𝐻1o) |
| 22 | 13, 21 | elini 4139 | 1 ⊢ ∅ ∈ ((∅𝐻∅) ∩ (∅𝐻1o)) |
| Colors of variables: wff setvar class |
| Syntax hints: ↔ wb 206 = wceq 1542 ⊤wtru 1543 ∈ wcel 2114 Vcvv 3429 ∩ cin 3888 ∅c0 4273 {cpr 4569 ⟶wf 6494 ‘cfv 6498 (class class class)co 7367 1oc1o 8398 2oc2o 8399 Hom chom 17231 SetCatcsetc 18042 |
| 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 2708 ax-rep 5212 ax-sep 5231 ax-nul 5241 ax-pow 5307 ax-pr 5375 ax-un 7689 ax-cnex 11094 ax-resscn 11095 ax-1cn 11096 ax-icn 11097 ax-addcl 11098 ax-addrcl 11099 ax-mulcl 11100 ax-mulrcl 11101 ax-mulcom 11102 ax-addass 11103 ax-mulass 11104 ax-distr 11105 ax-i2m1 11106 ax-1ne0 11107 ax-1rid 11108 ax-rnegex 11109 ax-rrecex 11110 ax-cnre 11111 ax-pre-lttri 11112 ax-pre-lttrn 11113 ax-pre-ltadd 11114 ax-pre-mulgt0 11115 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 849 df-3or 1088 df-3an 1089 df-tru 1545 df-fal 1555 df-ex 1782 df-nf 1786 df-sb 2069 df-mo 2539 df-eu 2569 df-clab 2715 df-cleq 2728 df-clel 2811 df-nfc 2885 df-ne 2933 df-nel 3037 df-ral 3052 df-rex 3062 df-reu 3343 df-rab 3390 df-v 3431 df-sbc 3729 df-csb 3838 df-dif 3892 df-un 3894 df-in 3896 df-ss 3906 df-pss 3909 df-nul 4274 df-if 4467 df-pw 4543 df-sn 4568 df-pr 4570 df-tp 4572 df-op 4574 df-uni 4851 df-iun 4935 df-br 5086 df-opab 5148 df-mpt 5167 df-tr 5193 df-id 5526 df-eprel 5531 df-po 5539 df-so 5540 df-fr 5584 df-we 5586 df-xp 5637 df-rel 5638 df-cnv 5639 df-co 5640 df-dm 5641 df-rn 5642 df-res 5643 df-ima 5644 df-pred 6265 df-ord 6326 df-on 6327 df-lim 6328 df-suc 6329 df-iota 6454 df-fun 6500 df-fn 6501 df-f 6502 df-f1 6503 df-fo 6504 df-f1o 6505 df-fv 6506 df-riota 7324 df-ov 7370 df-oprab 7371 df-mpo 7372 df-om 7818 df-1st 7942 df-2nd 7943 df-frecs 8231 df-wrecs 8262 df-recs 8311 df-rdg 8349 df-1o 8405 df-2o 8406 df-er 8643 df-map 8775 df-en 8894 df-dom 8895 df-sdom 8896 df-fin 8897 df-pnf 11181 df-mnf 11182 df-xr 11183 df-ltxr 11184 df-le 11185 df-sub 11379 df-neg 11380 df-nn 12175 df-2 12244 df-3 12245 df-4 12246 df-5 12247 df-6 12248 df-7 12249 df-8 12250 df-9 12251 df-n0 12438 df-z 12525 df-dec 12645 df-uz 12789 df-fz 13462 df-struct 17117 df-slot 17152 df-ndx 17164 df-base 17180 df-hom 17244 df-cco 17245 df-setc 18043 |
| This theorem is referenced by: (None) |
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