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Mirrors > Home > MPE Home > Th. List > neisspw | Structured version Visualization version GIF version |
Description: The neighborhoods of any set are subsets of the base set. (Contributed by Stefan O'Rear, 6-Aug-2015.) |
Ref | Expression |
---|---|
neifval.1 | β’ π = βͺ π½ |
Ref | Expression |
---|---|
neisspw | β’ (π½ β Top β ((neiβπ½)βπ) β π« π) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | neifval.1 | . . . . 5 β’ π = βͺ π½ | |
2 | 1 | neii1 22961 | . . . 4 β’ ((π½ β Top β§ π£ β ((neiβπ½)βπ)) β π£ β π) |
3 | velpw 4602 | . . . 4 β’ (π£ β π« π β π£ β π) | |
4 | 2, 3 | sylibr 233 | . . 3 β’ ((π½ β Top β§ π£ β ((neiβπ½)βπ)) β π£ β π« π) |
5 | 4 | ex 412 | . 2 β’ (π½ β Top β (π£ β ((neiβπ½)βπ) β π£ β π« π)) |
6 | 5 | ssrdv 3983 | 1 β’ (π½ β Top β ((neiβπ½)βπ) β π« π) |
Colors of variables: wff setvar class |
Syntax hints: β wi 4 β§ wa 395 = wceq 1533 β wcel 2098 β wss 3943 π« cpw 4597 βͺ cuni 4902 βcfv 6536 Topctop 22746 neicnei 22952 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1789 ax-4 1803 ax-5 1905 ax-6 1963 ax-7 2003 ax-8 2100 ax-9 2108 ax-10 2129 ax-11 2146 ax-12 2163 ax-ext 2697 ax-rep 5278 ax-sep 5292 ax-nul 5299 ax-pow 5356 ax-pr 5420 |
This theorem depends on definitions: df-bi 206 df-an 396 df-or 845 df-3an 1086 df-tru 1536 df-fal 1546 df-ex 1774 df-nf 1778 df-sb 2060 df-mo 2528 df-eu 2557 df-clab 2704 df-cleq 2718 df-clel 2804 df-nfc 2879 df-ne 2935 df-ral 3056 df-rex 3065 df-reu 3371 df-rab 3427 df-v 3470 df-sbc 3773 df-csb 3889 df-dif 3946 df-un 3948 df-in 3950 df-ss 3960 df-nul 4318 df-if 4524 df-pw 4599 df-sn 4624 df-pr 4626 df-op 4630 df-uni 4903 df-iun 4992 df-br 5142 df-opab 5204 df-mpt 5225 df-id 5567 df-xp 5675 df-rel 5676 df-cnv 5677 df-co 5678 df-dm 5679 df-rn 5680 df-res 5681 df-ima 5682 df-iota 6488 df-fun 6538 df-fn 6539 df-f 6540 df-f1 6541 df-fo 6542 df-f1o 6543 df-fv 6544 df-top 22747 df-nei 22953 |
This theorem is referenced by: hausflim 23836 flimclslem 23839 fclsfnflim 23882 |
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