From: Run Paint Run Run <redmine@...>
Date: 2009-11-09T23:01:21+09:00
Subject: [ruby-core:26649] [Bug #2189] Math.atanh(1) & Math.atanh(-1) should not raise an error

Issue #2189 has been updated by Run Paint Run Run.


For completeness, I'll note that IEE Std. 754 (2008) recommends (pp. 42-43) that atanh(x) signals a "divideByZero" exception when x == 1; and a "invalid operation" exception when x > 1. Both forms raise the "underflow" flag. Later (pp. 43-45) it is stated that "atanh(��1) is ����� and signals the divideByZero exception."

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http://redmine.ruby-lang.org/issues/show/2189

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