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I guess the asterisk has a general meaning at that position and probably should know it, but I just can't find it in amsmath manual.

Leonardo Castro
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    The star versions of the amsmath environments are unnumberred. – Bernard Dec 18 '15 at 00:59
  • I just noted that because my other question was answered, so that I could have \begin{gather} working and note that difference very obviously. Now I see why this question wasn't asked before... – Leonardo Castro Dec 18 '15 at 01:05
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    Related: http://tex.stackexchange.com/questions/9514/whats-the-difference-between-align-and-align – cryingshadow Dec 18 '15 at 01:51
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    Reading the manual helps ;-) Except for split, each environment has both starred and unstarred forms, where the unstarred forms have automatic numbering using LATEX's equation counter. (Section 3.1, 3rd. paragraph ;-)) –  Dec 18 '15 at 04:05
  • @ChristianHupfer I had control-effed for "asterisk" and "gather", didn't realize that the word to be searched was "starred". – Leonardo Castro Dec 18 '15 at 11:29
  • @LeonardoCastro: Admitted starred could be misleading, but gather yields the 2nd paragraph in the mentioned section and there's gather* –  Dec 18 '15 at 15:20
  • @ChristianHupfer Fair enough, mea culpa. I had searched for gather* but seen that it appeared only once while I expected a sentence like "gather* is used for..." My vision field didn't reach the second paragraph of that section immediately, so I found easier to ask it here. Anyway, am I the only one who uses this site mainly to avoid reading documentation of all packages I use. :-) Is this site only for advanced questions? – Leonardo Castro Dec 18 '15 at 20:07
  • @LeonardoCastro: No, but often reading the documentation clearifies the question before it is posted. However, there's documentation, that is not clear in all situations and some packages have hidden features not described anywhere. In this situation a 'non-advanced' question is fully justified. (And I am not one of the close voters ;-)) –  Dec 18 '15 at 20:10

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