Metamath Proof Explorer
Description: Absolute value of difference of absolute values. (Contributed by Paul
Chapman, 7-Sep-2007)
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Ref |
Expression |
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Hypotheses |
abs2difabsi.1 |
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abs2difabsi.2 |
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Assertion |
abs2difabsi |
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Proof
Step |
Hyp |
Ref |
Expression |
1 |
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abs2difabsi.1 |
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2 |
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abs2difabsi.2 |
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3 |
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abs2difabs |
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4 |
1 2 3
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mp2an |
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