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| Mirrors > Home > ILE Home > Th. List > eqeq12d | Unicode version | ||
| Description: A useful inference for substituting definitions into an equality. (Contributed by NM, 5-Aug-1993.) (Proof shortened by Andrew Salmon, 25-May-2011.) |
| Ref | Expression |
|---|---|
| eqeq12d.1 |
|
| eqeq12d.2 |
|
| Ref | Expression |
|---|---|
| eqeq12d |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | eqeq12d.1 |
. 2
| |
| 2 | eqeq12d.2 |
. 2
| |
| 3 | eqeq12 2209 |
. 2
| |
| 4 | 1, 2, 3 | syl2anc 411 |
1
|
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