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Mirrors > Home > ILE Home > Th. List > ssextss | Unicode version |
Description: An extensionality-like principle defining subclass in terms of subsets. (Contributed by NM, 30-Jun-2004.) |
Ref | Expression |
---|---|
ssextss |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | sspwb 4146 |
. 2
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2 | dfss2 3091 |
. 2
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3 | vex 2692 |
. . . . 5
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4 | 3 | elpw 3521 |
. . . 4
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5 | 3 | elpw 3521 |
. . . 4
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6 | 4, 5 | imbi12i 238 |
. . 3
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7 | 6 | albii 1447 |
. 2
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8 | 1, 2, 7 | 3bitri 205 |
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 105 ax-ia2 106 ax-ia3 107 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-14 1493 ax-17 1507 ax-i9 1511 ax-ial 1515 ax-i5r 1516 ax-ext 2122 ax-sep 4054 ax-pow 4106 |
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-in 3082 df-ss 3089 df-pw 3517 df-sn 3538 |
This theorem is referenced by: ssext 4151 nssssr 4152 |
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