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Related theorems Unicode version |
| Description: The complement of a closure is open. |
| Ref | Expression |
|---|---|
| clscld.1 |
|
| Ref | Expression |
|---|---|
| cmclsopn |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | clscld.1 |
. . . 4
| |
| 2 | 1 | clsval2 7627 |
. . 3
|
| 3 | 2 | difeq2d 2149 |
. 2
|
| 4 | difss 2157 |
. . . . . . 7
| |
| 5 | 1 | ntropn 7626 |
. . . . . . 7
|
| 6 | 4, 5 | mpan2 694 |
. . . . . 6
|
| 7 | 1 | eltopss 7545 |
. . . . . 6
|
| 8 | 6, 7 | mpdan 702 |
. . . . 5
|
| 9 | dfss4 2232 |
. . . . 5
| |
| 10 | 8, 9 | sylib 198 |
. . . 4
|
| 11 | 10, 6 | eqeltrd 1540 |
. . 3
|
| 12 | 11 | adantr 389 |
. 2
|
| 13 | 3, 12 | eqeltrd 1540 |
1
|
| Colors of variables: wff set class |
| Syntax hints: |
| This theorem is referenced by: elcls 7646 bcthlem9 7941 bcthlem10 7942 |
| This theorem was proved from axioms: ax-1 4 ax-2 5 ax-3 6 ax-mp 7 ax-7 959 ax-gen 960 ax-8 961 ax-9 962 ax-10 963 ax-11 964 ax-12 965 ax-13 966 ax-14 967 ax-17 968 ax-4 970 ax-5o 972 ax-6o 975 ax-9o 1119 ax-10o 1136 ax-16 1206 ax-11o 1213 ax-ext 1452 ax-rep 2683 ax-sep 2693 ax-pow 2732 ax-pr 2769 ax-un 2857 |
| This theorem depends on definitions: df-bi 147 df-or 224 df-an 225 df-ex 978 df-sb 1168 df-eu 1375 df-mo 1376 df-clab 1457 df-cleq 1462 df-clel 1465 df-ne 1579 df-ral 1641 df-rex 1642 df-rab 1644 df-v 1803 df-dif 2039 df-un 2040 df-in 2041 df-ss 2043 df-nul 2271 df-pw 2392 df-sn 2402 df-pr 2403 df-op 2406 df-uni 2494 df-int 2524 df-br 2610 df-opab 2657 df-id 2824 df-xp 3174 df-rel 3175 df-cnv 3176 df-co 3177 df-dm 3178 df-rn 3179 df-res 3180 df-ima 3181 df-fun 3182 df-fn 3183 df-fv 3188 df-top 7534 df-cld 7605 df-ntr 7606 df-cls 7607 |