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Mirrors > Home > ILE Home > Th. List > sbequ5 | Unicode version |
Description: Substitution does not change an identical variable specifier. (Contributed by NM, 5-Aug-1993.) (Revised by NM, 21-Dec-2004.) |
Ref | Expression |
---|---|
sbequ5 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | nfae 1682 | . 2 | |
2 | 1 | sbf 1735 | 1 |
Colors of variables: wff set class |
Syntax hints: wb 104 wal 1314 wsb 1720 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 105 ax-ia2 106 ax-ia3 107 ax-io 683 ax-5 1408 ax-7 1409 ax-gen 1410 ax-ie1 1454 ax-ie2 1455 ax-8 1467 ax-10 1468 ax-11 1469 ax-i12 1470 ax-4 1472 ax-17 1491 ax-i9 1495 ax-ial 1499 |
This theorem depends on definitions: df-bi 116 df-nf 1422 df-sb 1721 |
This theorem is referenced by: (None) |
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