Metamath Proof Explorer
Description: Reverse closure for addition: the second addend is real if the first
addend is real and the sum is real. (Contributed by SN, 25-Apr-2025)
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Ref |
Expression |
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Hypotheses |
readdrcl2d.a |
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readdrcl2d.b |
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readdrcl2d.c |
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Assertion |
readdrcl2d |
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Proof
Step |
Hyp |
Ref |
Expression |
1 |
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readdrcl2d.a |
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2 |
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readdrcl2d.b |
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3 |
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readdrcl2d.c |
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4 |
1
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recnd |
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5 |
4 2
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pncan2d |
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6 |
3 1
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resubcld |
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7 |
5 6
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eqeltrrd |
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