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Mirrors > Home > ILE Home > Th. List > eleqtri | Unicode version |
Description: Substitution of equal classes into membership relation. (Contributed by NM, 5-Aug-1993.) |
Ref | Expression |
---|---|
eleqtr.1 | |
eleqtr.2 |
Ref | Expression |
---|---|
eleqtri |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | eleqtr.1 | . 2 | |
2 | eleqtr.2 | . . 3 | |
3 | 2 | eleq2i 2145 | . 2 |
4 | 1, 3 | mpbi 143 | 1 |
Colors of variables: wff set class |
Syntax hints: wceq 1284 wcel 1433 |
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-5 1376 ax-gen 1378 ax-ie1 1422 ax-ie2 1423 ax-4 1440 ax-17 1459 ax-ial 1467 ax-ext 2063 |
This theorem depends on definitions: df-bi 115 df-cleq 2074 df-clel 2077 |
This theorem is referenced by: eleqtrri 2154 3eltr3i 2159 prid2 3499 2eluzge0 8663 fz01or 10278 |
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