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when toggle format what by license comment
Aug 22, 2018 at 23:36 history edited David Roberts CC BY-SA 4.0
Replaced \bullet by \cdot, as mentioned in the comments
Jan 15, 2018 at 10:21 comment added Christian Blatter @ar2015: It just means scalar product. I should have used $\cdot$ instead of the bullet.
Jan 15, 2018 at 0:01 comment added ar2015 What does bullet dot mean? any article or book about it? which field of math focus on this topic? many thanks.
Jan 28, 2011 at 12:36 vote accept DaveB
Jan 22, 2011 at 19:50 history answered Christian Blatter CC BY-SA 2.5