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 5999 | . 2 ⊢ ∅:∅⟶∅ | |
2 | cnv0 5454 | . . . . . 6 ⊢ ◡∅ = ∅ | |
3 | 2 | imaeq1i 5382 | . . . . 5 ⊢ (◡∅ “ 𝑥) = (∅ “ 𝑥) |
4 | 0ima 5401 | . . . . 5 ⊢ (∅ “ 𝑥) = ∅ | |
5 | 3, 4 | eqtri 2632 | . . . 4 ⊢ (◡∅ “ 𝑥) = ∅ |
6 | 0ex 4718 | . . . . 5 ⊢ ∅ ∈ V | |
7 | 6 | snid 4155 | . . . 4 ⊢ ∅ ∈ {∅} |
8 | 5, 7 | eqeltri 2684 | . . 3 ⊢ (◡∅ “ 𝑥) ∈ {∅} |
9 | 8 | rgenw 2908 | . 2 ⊢ ∀𝑥 ∈ {∅} (◡∅ “ 𝑥) ∈ {∅} |
10 | sn0topon 20612 | . . 3 ⊢ {∅} ∈ (TopOn‘∅) | |
11 | iscn 20849 | . . 3 ⊢ (({∅} ∈ (TopOn‘∅) ∧ {∅} ∈ (TopOn‘∅)) → (∅ ∈ ({∅} Cn {∅}) ↔ (∅:∅⟶∅ ∧ ∀𝑥 ∈ {∅} (◡∅ “ 𝑥) ∈ {∅}))) | |
12 | 10, 10, 11 | mp2an 704 | . 2 ⊢ (∅ ∈ ({∅} Cn {∅}) ↔ (∅:∅⟶∅ ∧ ∀𝑥 ∈ {∅} (◡∅ “ 𝑥) ∈ {∅})) |
13 | 1, 9, 12 | mpbir2an 957 | 1 ⊢ ∅ ∈ ({∅} Cn {∅}) |
Colors of variables: wff setvar class |
Syntax hints: ↔ wb 195 ∧ wa 383 ∈ wcel 1977 ∀wral 2896 ∅c0 3874 {csn 4125 ◡ccnv 5037 “ cima 5041 ⟶wf 5800 ‘cfv 5804 (class class class)co 6549 TopOnctopon 20518 Cn ccn 20838 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1713 ax-4 1728 ax-5 1827 ax-6 1875 ax-7 1922 ax-8 1979 ax-9 1986 ax-10 2006 ax-11 2021 ax-12 2034 ax-13 2234 ax-ext 2590 ax-sep 4709 ax-nul 4717 ax-pow 4769 ax-pr 4833 ax-un 6847 |
This theorem depends on definitions: df-bi 196 df-or 384 df-an 385 df-3an 1033 df-tru 1478 df-ex 1696 df-nf 1701 df-sb 1868 df-eu 2462 df-mo 2463 df-clab 2597 df-cleq 2603 df-clel 2606 df-nfc 2740 df-ne 2782 df-ral 2901 df-rex 2902 df-rab 2905 df-v 3175 df-sbc 3403 df-dif 3543 df-un 3545 df-in 3547 df-ss 3554 df-nul 3875 df-if 4037 df-pw 4110 df-sn 4126 df-pr 4128 df-op 4132 df-uni 4373 df-br 4584 df-opab 4644 df-mpt 4645 df-id 4953 df-xp 5044 df-rel 5045 df-cnv 5046 df-co 5047 df-dm 5048 df-rn 5049 df-res 5050 df-ima 5051 df-iota 5768 df-fun 5806 df-fn 5807 df-f 5808 df-fv 5812 df-ov 6552 df-oprab 6553 df-mpt2 6554 df-map 7746 df-top 20521 df-topon 20523 df-cn 20841 |
This theorem is referenced by: cncfiooicc 38780 |
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