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Mirrors > Home > ILE Home > Th. List > sbf2 | Unicode version |
Description: Substitution has no effect on a bound variable. (Contributed by NM, 1-Jul-2005.) |
Ref | Expression |
---|---|
sbf2 |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | nfa1 1489 |
. 2
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2 | 1 | sbf 1718 |
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-5 1391 ax-gen 1393 ax-ie1 1437 ax-ie2 1438 ax-4 1455 ax-i9 1478 ax-ial 1482 |
This theorem depends on definitions: df-bi 116 df-nf 1405 df-sb 1704 |
This theorem is referenced by: (None) |
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