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Mirrors > Home > ILE Home > Th. List > onss | Unicode version |
Description: An ordinal number is a subset of the class of ordinal numbers. (Contributed by NM, 5-Jun-1994.) |
Ref | Expression |
---|---|
onss |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | eloni 4211 |
. 2
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2 | ordsson 4322 |
. 2
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3 | 1, 2 | syl 14 |
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 105 ax-ia2 106 ax-ia3 107 ax-io 666 ax-5 1382 ax-7 1383 ax-gen 1384 ax-ie1 1428 ax-ie2 1429 ax-8 1441 ax-10 1442 ax-11 1443 ax-i12 1444 ax-bndl 1445 ax-4 1446 ax-17 1465 ax-i9 1469 ax-ial 1473 ax-i5r 1474 ax-ext 2071 |
This theorem depends on definitions: df-bi 116 df-3an 927 df-tru 1293 df-nf 1396 df-sb 1694 df-clab 2076 df-cleq 2082 df-clel 2085 df-nfc 2218 df-ral 2365 df-rex 2366 df-v 2622 df-in 3006 df-ss 3013 df-uni 3660 df-tr 3943 df-iord 4202 df-on 4204 |
This theorem is referenced by: onuni 4324 onssi 4345 tfrexlem 6113 tfri3 6146 rdgivallem 6160 bj-omssonALT 12131 |
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