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Mirrors > Home > ILE Home > Th. List > prssg | Unicode version |
Description: A pair of elements of a class is a subset of the class. Theorem 7.5 of [Quine] p. 49. (Contributed by NM, 22-Mar-2006.) (Proof shortened by Andrew Salmon, 29-Jun-2011.) |
Ref | Expression |
---|---|
prssg |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | snssg 3741 |
. . 3
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2 | snssg 3741 |
. . 3
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3 | 1, 2 | bi2anan9 606 |
. 2
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4 | unss 3324 |
. . 3
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5 | df-pr 3614 |
. . . 4
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6 | 5 | sseq1i 3196 |
. . 3
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7 | 4, 6 | bitr4i 187 |
. 2
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8 | 3, 7 | bitrdi 196 |
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-tru 1367 df-nf 1472 df-sb 1774 df-clab 2176 df-cleq 2182 df-clel 2185 df-nfc 2321 df-v 2754 df-un 3148 df-in 3150 df-ss 3157 df-sn 3613 df-pr 3614 |
This theorem is referenced by: prssi 3765 prsspwg 3767 topgele 13989 |
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