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when toggle format what by license comment
Jan 17, 2019 at 16:19 vote accept Hailong Dao
Jan 16, 2019 at 23:24 answer added Hailong Dao timeline score: 7
Jan 15, 2019 at 17:05 comment added Hailong Dao It is the colon ideal. $I:J = \{f, fJ\subseteq I\}$.
Jan 15, 2019 at 17:01 comment added Fedor Petrov sorry, what does a colon denote?
Jan 15, 2019 at 16:10 history asked Hailong Dao CC BY-SA 4.0