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Mirrors > Home > MPE Home > Th. List > rintopn | Structured version Visualization version Unicode version |
Description: A finite relative intersection of open sets is open. (Contributed by Mario Carneiro, 22-Aug-2015.) |
Ref | Expression |
---|---|
1open.1 |
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Ref | Expression |
---|---|
rintopn |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | intiin 4323 |
. . 3
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2 | 1 | ineq2i 3622 |
. 2
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3 | dfss3 3408 |
. . 3
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4 | 1open.1 |
. . . . 5
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5 | 4 | riinopn 20015 |
. . . 4
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6 | 5 | 3com23 1237 |
. . 3
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7 | 3, 6 | syl3an2b 1329 |
. 2
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8 | 2, 7 | syl5eqel 2553 |
1
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Colors of variables: wff setvar class |
Syntax hints: ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1677 ax-4 1690 ax-5 1766 ax-6 1813 ax-7 1859 ax-8 1906 ax-9 1913 ax-10 1932 ax-11 1937 ax-12 1950 ax-13 2104 ax-ext 2451 ax-sep 4518 ax-nul 4527 ax-pow 4579 ax-pr 4639 ax-un 6602 |
This theorem depends on definitions: df-bi 190 df-or 377 df-an 378 df-3or 1008 df-3an 1009 df-tru 1455 df-ex 1672 df-nf 1676 df-sb 1806 df-eu 2323 df-mo 2324 df-clab 2458 df-cleq 2464 df-clel 2467 df-nfc 2601 df-ne 2643 df-ral 2761 df-rex 2762 df-reu 2763 df-rab 2765 df-v 3033 df-sbc 3256 df-csb 3350 df-dif 3393 df-un 3395 df-in 3397 df-ss 3404 df-pss 3406 df-nul 3723 df-if 3873 df-pw 3944 df-sn 3960 df-pr 3962 df-tp 3964 df-op 3966 df-uni 4191 df-int 4227 df-iun 4271 df-iin 4272 df-br 4396 df-opab 4455 df-mpt 4456 df-tr 4491 df-eprel 4750 df-id 4754 df-po 4760 df-so 4761 df-fr 4798 df-we 4800 df-xp 4845 df-rel 4846 df-cnv 4847 df-co 4848 df-dm 4849 df-rn 4850 df-res 4851 df-ima 4852 df-pred 5387 df-ord 5433 df-on 5434 df-lim 5435 df-suc 5436 df-iota 5553 df-fun 5591 df-fn 5592 df-f 5593 df-f1 5594 df-fo 5595 df-f1o 5596 df-fv 5597 df-ov 6311 df-oprab 6312 df-mpt2 6313 df-om 6712 df-1st 6812 df-2nd 6813 df-wrecs 7046 df-recs 7108 df-rdg 7146 df-1o 7200 df-oadd 7204 df-er 7381 df-en 7588 df-dom 7589 df-fin 7591 df-top 19998 |
This theorem is referenced by: ptcnplem 20713 tmdgsum2 21189 limciun 22928 |
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