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| Mirrors > Home > ILE Home > Th. List > cncnpi | Unicode version | ||
| Description: A continuous function is continuous at all points. One direction of Theorem 7.2(g) of [Munkres] p. 107. (Contributed by Raph Levien, 20-Nov-2006.) (Proof shortened by Mario Carneiro, 21-Aug-2015.) |
| Ref | Expression |
|---|---|
| cnsscnp.1 |
|
| Ref | Expression |
|---|---|
| cncnpi |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | cnsscnp.1 |
. . . 4
| |
| 2 | eqid 2238 |
. . . 4
| |
| 3 | 1, 2 | cnf 15228 |
. . 3
|
| 4 | 3 | adantr 276 |
. 2
|
| 5 | cnima 15244 |
. . . . . 6
| |
| 6 | 5 | ad2ant2r 513 |
. . . . 5
|
| 7 | simpr 110 |
. . . . . . 7
| |
| 8 | 7 | adantr 276 |
. . . . . 6
|
| 9 | simprr 537 |
. . . . . 6
| |
| 10 | 3 | ad2antrr 492 |
. . . . . . 7
|
| 11 | ffn 5528 |
. . . . . . 7
| |
| 12 | elpreima 5819 |
. . . . . . 7
| |
| 13 | 10, 11, 12 | 3syl 17 |
. . . . . 6
|
| 14 | 8, 9, 13 | mpbir2and 957 |
. . . . 5
|
| 15 | eqimss 3302 |
. . . . . . . 8
| |
| 16 | 15 | biantrud 304 |
. . . . . . 7
|
| 17 | eleq2 2302 |
. . . . . . 7
| |
| 18 | 16, 17 | bitr3d 190 |
. . . . . 6
|
| 19 | 18 | rspcev 2929 |
. . . . 5
|
| 20 | 6, 14, 19 | syl2anc 415 |
. . . 4
|
| 21 | 20 | expr 375 |
. . 3
|
| 22 | 21 | ralrimiva 2623 |
. 2
|
| 23 | cntop1 15225 |
. . . . 5
| |
| 24 | 23 | adantr 276 |
. . . 4
|
| 25 | 1 | toptopon 15042 |
. . . 4
|
| 26 | 24, 25 | sylib 122 |
. . 3
|
| 27 | cntop2 15226 |
. . . . 5
| |
| 28 | 27 | adantr 276 |
. . . 4
|
| 29 | 2 | toptopon 15042 |
. . . 4
|
| 30 | 28, 29 | sylib 122 |
. . 3
|
| 31 | iscnp3 15227 |
. . 3
| |
| 32 | 26, 30, 7, 31 | syl3anc 1278 |
. 2
|
| 33 | 4, 22, 32 | mpbir2and 957 |
1
|
| Colors of variables: wff set class |
| Syntax hints: |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-in1 623 ax-in2 624 ax-io 721 ax-5 1500 ax-7 1501 ax-gen 1502 ax-ie1 1546 ax-ie2 1547 ax-8 1557 ax-10 1558 ax-11 1559 ax-i12 1560 ax-bndl 1562 ax-4 1563 ax-17 1579 ax-i9 1583 ax-ial 1587 ax-i5r 1588 ax-14 2212 ax-ext 2220 ax-sep 4244 ax-pow 4306 ax-pr 4341 ax-un 4573 ax-setind 4679 |
| This theorem depends on definitions: df-bi 117 df-3an 1011 df-tru 1405 df-fal 1408 df-nf 1514 df-sb 1816 df-eu 2089 df-mo 2090 df-clab 2225 df-cleq 2231 df-clel 2234 df-nfc 2381 df-ne 2421 df-ral 2533 df-rex 2534 df-rab 2537 df-v 2823 df-sbc 3052 df-csb 3148 df-dif 3222 df-un 3224 df-in 3226 df-ss 3233 df-pw 3687 df-sn 3711 df-pr 3712 df-op 3714 df-uni 3931 df-iun 4009 df-br 4126 df-opab 4188 df-mpt 4189 df-id 4433 df-xp 4775 df-rel 4776 df-cnv 4777 df-co 4778 df-dm 4779 df-rn 4780 df-res 4781 df-ima 4782 df-iota 5332 df-fun 5374 df-fn 5375 df-f 5376 df-fv 5380 df-ov 6078 df-oprab 6079 df-mpo 6080 df-1st 6364 df-2nd 6365 df-map 6914 df-top 15022 df-topon 15035 df-cn 15212 df-cnp 15213 |
| This theorem is referenced by: cnsscnp 15253 cncnp 15254 lmcn 15275 dvcnp2cntop 15723 dvaddxxbr 15725 dvmulxxbr 15726 dvcoapbr 15731 dvcjbr 15732 |
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