What does __Rule do in Mathematica?

Asked Jun 04 '15 at 16:28

Active Jun 04 '15 at 16:28

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What does __Rule do in mathematica? I understand the __ is used for any repeated expression, but why is the Rule appended at the end?

Thanks!

edited Apr 13 '17 at 12:55

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asked Jun 04 '15 at 16:28

Michael Yoo

3

_ matches anything while _f matches only expressions with head f. Take a look at the first few sections here: http://reference.wolfram.com/language/tutorial/PatternsOverview.html – Szabolcs Jun 04 '15 at 16:39

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