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Mirrors > Home > MPE Home > Th. List > eqeq1d | Structured version Visualization version Unicode version |
Description: Deduction from equality to equivalence of equalities. (Contributed by NM, 27-Dec-1993.) Reduce dependencies on axioms. (Revised by Wolf Lammen, 5-Dec-2019.) |
Ref | Expression |
---|---|
eqeq1d.1 |
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Ref | Expression |
---|---|
eqeq1d |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | eqeq1d.1 |
. . 3
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2 | dfcleq 2616 |
. . . 4
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3 | 2 | biimpi 206 |
. . 3
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4 | bibi1 341 |
. . . 4
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5 | 4 | alimi 1739 |
. . 3
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6 | albi 1746 |
. . 3
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7 | 1, 3, 5, 6 | 4syl 19 |
. 2
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8 | dfcleq 2616 |
. 2
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9 | dfcleq 2616 |
. 2
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10 | 7, 8, 9 | 3bitr4g 303 |
1
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