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Mirrors > Home > ILE Home > Th. List > sbcssg | Unicode version |
Description: Distribute proper substitution through a subclass relation. (Contributed by Alan Sare, 22-Jul-2012.) (Proof shortened by Alexander van der Vekens, 23-Jul-2017.) |
Ref | Expression |
---|---|
sbcssg |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | sbcalg 3038 |
. . 3
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2 | sbcimg 3027 |
. . . . 5
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3 | sbcel2g 3101 |
. . . . . 6
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4 | sbcel2g 3101 |
. . . . . 6
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5 | 3, 4 | imbi12d 234 |
. . . . 5
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6 | 2, 5 | bitrd 188 |
. . . 4
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7 | 6 | albidv 1835 |
. . 3
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8 | 1, 7 | bitrd 188 |
. 2
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9 | dfss2 3168 |
. . 3
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10 | 9 | sbcbii 3045 |
. 2
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11 | dfss2 3168 |
. 2
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12 | 8, 10, 11 | 3bitr4g 223 |
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 2175 |
This theorem depends on definitions: df-bi 117 df-tru 1367 df-nf 1472 df-sb 1774 df-clab 2180 df-cleq 2186 df-clel 2189 df-nfc 2325 df-v 2762 df-sbc 2986 df-csb 3081 df-in 3159 df-ss 3166 |
This theorem is referenced by: sbcrel 4745 sbcfg 5402 |
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