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Mirrors > Home > ILE Home > Th. List > ordin | Unicode version |
Description: The intersection of two ordinal classes is ordinal. Proposition 7.9 of [TakeutiZaring] p. 37. (Contributed by NM, 9-May-1994.) |
Ref | Expression |
---|---|
ordin |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | ordtr 4205 |
. . 3
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2 | ordtr 4205 |
. . 3
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3 | trin 3946 |
. . 3
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4 | 1, 2, 3 | syl2an 283 |
. 2
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5 | inss2 3221 |
. . 3
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6 | trssord 4207 |
. . 3
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7 | 5, 6 | mp3an2 1261 |
. 2
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8 | 4, 7 | sylancom 411 |
1
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Colors of variables: wff set class |
Syntax hints: ![]() ![]() ![]() ![]() ![]() ![]() |
This theorem was proved from axioms: ax-1 5 ax-2 6 ax-mp 7 ax-ia1 104 ax-ia2 105 ax-ia3 106 ax-io 665 ax-5 1381 ax-7 1382 ax-gen 1383 ax-ie1 1427 ax-ie2 1428 ax-8 1440 ax-10 1441 ax-11 1442 ax-i12 1443 ax-bndl 1444 ax-4 1445 ax-17 1464 ax-i9 1468 ax-ial 1472 ax-i5r 1473 ax-ext 2070 |
This theorem depends on definitions: df-bi 115 df-3an 926 df-tru 1292 df-nf 1395 df-sb 1693 df-clab 2075 df-cleq 2081 df-clel 2084 df-nfc 2217 df-ral 2364 df-v 2621 df-in 3005 df-ss 3012 df-uni 3654 df-tr 3937 df-iord 4193 |
This theorem is referenced by: onin 4213 smores 6057 smores2 6059 |
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