println(f"sign of {x}: {sign}"); // sign of 42: 1
In lf-lean, 90% of statements depend on at least one prior statement.
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but we have to make a choice because the two limits are not the same. For example, ArcCosh[-2 + 0.001 I] returns 1.31696 + 3.14102 I but ArcCosh[-2 - 0.001 I] returns 1.31696 - 3.14102 I. By convention, we choose the limit from above.
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