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Jan 30, 2018 at 9:45 vote accept Thomas Aquilera
Jan 30, 2018 at 11:44
Jan 29, 2018 at 22:53 comment added secavara How formal do you want your definition? Check the answers in this link.
Jan 29, 2018 at 21:12 comment added Thomas Aquilera The question is how is trace being done mathematically?
Jan 29, 2018 at 20:36 history edited secavara CC BY-SA 3.0
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Jan 29, 2018 at 20:28 history answered secavara CC BY-SA 3.0