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May 5, 2013 at 17:44 comment added Silvia @whuber Thanks! I like your InverseFunction method!
May 5, 2013 at 17:37 comment added whuber +1: correct, informative, detailed, and rather pretty, too!
May 5, 2013 at 0:35 history answered Silvia CC BY-SA 3.0