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Mirrors > Home > ILE Home > Th. List > unidif0 | Unicode version |
Description: The removal of the empty set from a class does not affect its union. (Contributed by NM, 22-Mar-2004.) |
Ref | Expression |
---|---|
unidif0 |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | n0i 3373 |
. . . . . . 7
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2 | 1 | pm4.71i 389 |
. . . . . 6
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3 | 2 | anbi1i 454 |
. . . . 5
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4 | an32 552 |
. . . . 5
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5 | anass 399 |
. . . . 5
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6 | 3, 4, 5 | 3bitr2ri 208 |
. . . 4
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7 | 6 | exbii 1585 |
. . 3
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8 | eluni 3747 |
. . . 4
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9 | eldif 3085 |
. . . . . . 7
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10 | velsn 3549 |
. . . . . . . . 9
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11 | 10 | notbii 658 |
. . . . . . . 8
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12 | 11 | anbi2i 453 |
. . . . . . 7
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13 | 9, 12 | bitri 183 |
. . . . . 6
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14 | 13 | anbi2i 453 |
. . . . 5
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15 | 14 | exbii 1585 |
. . . 4
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16 | 8, 15 | bitri 183 |
. . 3
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17 | eluni 3747 |
. . 3
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18 | 7, 16, 17 | 3bitr4i 211 |
. 2
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19 | 18 | eqriv 2137 |
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 105 ax-ia2 106 ax-ia3 107 ax-in1 604 ax-in2 605 ax-io 699 ax-5 1424 ax-7 1425 ax-gen 1426 ax-ie1 1470 ax-ie2 1471 ax-8 1483 ax-10 1484 ax-11 1485 ax-i12 1486 ax-bndl 1487 ax-4 1488 ax-17 1507 ax-i9 1511 ax-ial 1515 ax-i5r 1516 ax-ext 2122 |
This theorem depends on definitions: df-bi 116 df-tru 1335 df-nf 1438 df-sb 1737 df-clab 2127 df-cleq 2133 df-clel 2136 df-nfc 2271 df-v 2691 df-dif 3078 df-nul 3369 df-sn 3538 df-uni 3745 |
This theorem is referenced by: (None) |
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