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Mirrors > Home > ILE Home > Th. List > ss2ab | Unicode version |
Description: Class abstractions in a subclass relationship. (Contributed by NM, 3-Jul-1994.) |
Ref | Expression |
---|---|
ss2ab |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | nfab1 2334 |
. . 3
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2 | nfab1 2334 |
. . 3
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3 | 1, 2 | dfss2f 3161 |
. 2
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4 | abid 2177 |
. . . 4
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5 | abid 2177 |
. . . 4
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6 | 4, 5 | imbi12i 239 |
. . 3
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7 | 6 | albii 1481 |
. 2
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8 | 3, 7 | bitri 184 |
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-io 710 ax-5 1458 ax-7 1459 ax-gen 1460 ax-ie1 1504 ax-ie2 1505 ax-8 1515 ax-10 1516 ax-11 1517 ax-i12 1518 ax-bndl 1520 ax-4 1521 ax-17 1537 ax-i9 1541 ax-ial 1545 ax-i5r 1546 ax-ext 2171 |
This theorem depends on definitions: df-bi 117 df-nf 1472 df-sb 1774 df-clab 2176 df-cleq 2182 df-clel 2185 df-nfc 2321 df-in 3150 df-ss 3157 |
This theorem is referenced by: abss 3239 ssab 3240 ss2abi 3242 ss2abdv 3243 ss2rab 3246 rabss2 3253 iotanul 5211 iotass 5213 |
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