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Mirrors > Home > ILE Home > Th. List > uncld | Unicode version |
Description: The union of two closed sets is closed. Equivalent to Theorem 6.1(3) of [Munkres] p. 93. (Contributed by NM, 5-Oct-2006.) |
Ref | Expression |
---|---|
uncld |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | difundi 3323 | . . 3 | |
2 | cldrcl 12260 | . . . . 5 | |
3 | 2 | adantr 274 | . . . 4 |
4 | eqid 2137 | . . . . . 6 | |
5 | 4 | cldopn 12265 | . . . . 5 |
6 | 5 | adantr 274 | . . . 4 |
7 | 4 | cldopn 12265 | . . . . 5 |
8 | 7 | adantl 275 | . . . 4 |
9 | inopn 12159 | . . . 4 | |
10 | 3, 6, 8, 9 | syl3anc 1216 | . . 3 |
11 | 1, 10 | eqeltrid 2224 | . 2 |
12 | 4 | cldss 12263 | . . . . 5 |
13 | 4 | cldss 12263 | . . . . 5 |
14 | 12, 13 | anim12i 336 | . . . 4 |
15 | unss 3245 | . . . 4 | |
16 | 14, 15 | sylib 121 | . . 3 |
17 | 4 | iscld2 12262 | . . 3 |
18 | 3, 16, 17 | syl2anc 408 | . 2 |
19 | 11, 18 | mpbird 166 | 1 |
Colors of variables: wff set class |
Syntax hints: wi 4 wa 103 wb 104 wcel 1480 cdif 3063 cun 3064 cin 3065 wss 3066 cuni 3731 cfv 5118 ctop 12153 ccld 12250 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 105 ax-ia2 106 ax-ia3 107 ax-in1 603 ax-in2 604 ax-io 698 ax-5 1423 ax-7 1424 ax-gen 1425 ax-ie1 1469 ax-ie2 1470 ax-8 1482 ax-10 1483 ax-11 1484 ax-i12 1485 ax-bndl 1486 ax-4 1487 ax-13 1491 ax-14 1492 ax-17 1506 ax-i9 1510 ax-ial 1514 ax-i5r 1515 ax-ext 2119 ax-sep 4041 ax-pow 4093 ax-pr 4126 ax-un 4350 |
This theorem depends on definitions: df-bi 116 df-3an 964 df-tru 1334 df-nf 1437 df-sb 1736 df-eu 2000 df-mo 2001 df-clab 2124 df-cleq 2130 df-clel 2133 df-nfc 2268 df-ral 2419 df-rex 2420 df-rab 2423 df-v 2683 df-sbc 2905 df-dif 3068 df-un 3070 df-in 3072 df-ss 3079 df-pw 3507 df-sn 3528 df-pr 3529 df-op 3531 df-uni 3732 df-br 3925 df-opab 3985 df-mpt 3986 df-id 4210 df-xp 4540 df-rel 4541 df-cnv 4542 df-co 4543 df-dm 4544 df-iota 5083 df-fun 5120 df-fn 5121 df-fv 5126 df-top 12154 df-cld 12253 |
This theorem is referenced by: iuncld 12273 |
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