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Mirrors > Home > ILE Home > Th. List > baspartn | Unicode version |
Description: A disjoint system of sets is a basis for a topology. (Contributed by Stefan O'Rear, 22-Feb-2015.) |
Ref | Expression |
---|---|
baspartn |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | id 19 |
. . . . . . . . 9
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2 | pwidg 3601 |
. . . . . . . . 9
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3 | 1, 2 | elind 3332 |
. . . . . . . 8
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4 | elssuni 3849 |
. . . . . . . 8
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5 | 3, 4 | syl 14 |
. . . . . . 7
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6 | inidm 3356 |
. . . . . . . . 9
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7 | ineq2 3342 |
. . . . . . . . 9
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8 | 6, 7 | eqtr3id 2234 |
. . . . . . . 8
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9 | 8 | pweqd 3592 |
. . . . . . . . . 10
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10 | 9 | ineq2d 3348 |
. . . . . . . . 9
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11 | 10 | unieqd 3832 |
. . . . . . . 8
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12 | 8, 11 | sseq12d 3198 |
. . . . . . 7
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13 | 5, 12 | syl5ibcom 155 |
. . . . . 6
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14 | 0ss 3473 |
. . . . . . . 8
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15 | sseq1 3190 |
. . . . . . . 8
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16 | 14, 15 | mpbiri 168 |
. . . . . . 7
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17 | 16 | a1i 9 |
. . . . . 6
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18 | 13, 17 | jaod 718 |
. . . . 5
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19 | 18 | ralimdv 2555 |
. . . 4
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20 | 19 | ralimia 2548 |
. . 3
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21 | 20 | adantl 277 |
. 2
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22 | isbasisg 13815 |
. . 3
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23 | 22 | adantr 276 |
. 2
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24 | 21, 23 | mpbird 167 |
1
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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 615 ax-in2 616 ax-io 710 ax-5 1457 ax-7 1458 ax-gen 1459 ax-ie1 1503 ax-ie2 1504 ax-8 1514 ax-10 1515 ax-11 1516 ax-i12 1517 ax-bndl 1519 ax-4 1520 ax-17 1536 ax-i9 1540 ax-ial 1544 ax-i5r 1545 ax-ext 2169 |
This theorem depends on definitions: df-bi 117 df-tru 1366 df-nf 1471 df-sb 1773 df-clab 2174 df-cleq 2180 df-clel 2183 df-nfc 2318 df-ral 2470 df-rex 2471 df-v 2751 df-dif 3143 df-in 3147 df-ss 3154 df-nul 3435 df-pw 3589 df-uni 3822 df-bases 13814 |
This theorem is referenced by: (None) |
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