Mathbox for Glauco Siliprandi |
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Mirrors > Home > MPE Home > Th. List > Mathboxes > 0cnf | Structured version Visualization version GIF version |
Description: The empty set is a continuous function. (Contributed by Glauco Siliprandi, 11-Dec-2019.) |
Ref | Expression |
---|---|
0cnf | ⊢ ∅ ∈ ({∅} Cn {∅}) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | f0 6562 | . 2 ⊢ ∅:∅⟶∅ | |
2 | cnv0 6001 | . . . . . 6 ⊢ ◡∅ = ∅ | |
3 | 2 | imaeq1i 5928 | . . . . 5 ⊢ (◡∅ “ 𝑥) = (∅ “ 𝑥) |
4 | 0ima 5948 | . . . . 5 ⊢ (∅ “ 𝑥) = ∅ | |
5 | 3, 4 | eqtri 2846 | . . . 4 ⊢ (◡∅ “ 𝑥) = ∅ |
6 | 0ex 5213 | . . . . 5 ⊢ ∅ ∈ V | |
7 | 6 | snid 4603 | . . . 4 ⊢ ∅ ∈ {∅} |
8 | 5, 7 | eqeltri 2911 | . . 3 ⊢ (◡∅ “ 𝑥) ∈ {∅} |
9 | 8 | rgenw 3152 | . 2 ⊢ ∀𝑥 ∈ {∅} (◡∅ “ 𝑥) ∈ {∅} |
10 | sn0topon 21608 | . . 3 ⊢ {∅} ∈ (TopOn‘∅) | |
11 | iscn 21845 | . . 3 ⊢ (({∅} ∈ (TopOn‘∅) ∧ {∅} ∈ (TopOn‘∅)) → (∅ ∈ ({∅} Cn {∅}) ↔ (∅:∅⟶∅ ∧ ∀𝑥 ∈ {∅} (◡∅ “ 𝑥) ∈ {∅}))) | |
12 | 10, 10, 11 | mp2an 690 | . 2 ⊢ (∅ ∈ ({∅} Cn {∅}) ↔ (∅:∅⟶∅ ∧ ∀𝑥 ∈ {∅} (◡∅ “ 𝑥) ∈ {∅})) |
13 | 1, 9, 12 | mpbir2an 709 | 1 ⊢ ∅ ∈ ({∅} Cn {∅}) |
Colors of variables: wff setvar class |
Syntax hints: ↔ wb 208 ∧ wa 398 ∈ wcel 2114 ∀wral 3140 ∅c0 4293 {csn 4569 ◡ccnv 5556 “ cima 5560 ⟶wf 6353 ‘cfv 6357 (class class class)co 7158 TopOnctopon 21520 Cn ccn 21834 |
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 1970 ax-7 2015 ax-8 2116 ax-9 2124 ax-10 2145 ax-11 2161 ax-12 2177 ax-ext 2795 ax-sep 5205 ax-nul 5212 ax-pow 5268 ax-pr 5332 ax-un 7463 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-3an 1085 df-tru 1540 df-ex 1781 df-nf 1785 df-sb 2070 df-mo 2622 df-eu 2654 df-clab 2802 df-cleq 2816 df-clel 2895 df-nfc 2965 df-ral 3145 df-rex 3146 df-rab 3149 df-v 3498 df-sbc 3775 df-dif 3941 df-un 3943 df-in 3945 df-ss 3954 df-nul 4294 df-if 4470 df-pw 4543 df-sn 4570 df-pr 4572 df-op 4576 df-uni 4841 df-br 5069 df-opab 5131 df-mpt 5149 df-id 5462 df-xp 5563 df-rel 5564 df-cnv 5565 df-co 5566 df-dm 5567 df-rn 5568 df-res 5569 df-ima 5570 df-iota 6316 df-fun 6359 df-fn 6360 df-f 6361 df-fv 6365 df-ov 7161 df-oprab 7162 df-mpo 7163 df-map 8410 df-top 21504 df-topon 21521 df-cn 21837 |
This theorem is referenced by: cncfiooicc 42184 |
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