Sorry about using English.
I can only type English now.
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1. You dont have to go to the classroom today,
the arranged course this week in the syllabus is halted
due to the IUMRS conference.
Sorry about such late informing since i'm quite busy this week.
2. Remember to submit your homework IN CLASS on the next Thursday.
3. It is a very good idea to preview something about stereographic projections
this part is kinda abstract for beginners.
Have a nice week!
Yuting
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