There has been a problem 
on https://ncatlab.org/homotopytypetheory/show/open+problems#coquands_five_open_problems 
about defining a multiplication on the surreal numbers as defined in the 
HoTT book. For a solution, see https://arxiv.org/pdf/1812.00051.pdf. 

Comments are welcome. 

I can be reached at jsjean00@gmail.com.

-- 
You received this message because you are subscribed to the Google Groups "Homotopy Type Theory" group.
To unsubscribe from this group and stop receiving emails from it, send an email to HomotopyTypeTheory+unsubscribe@googlegroups.com.
For more options, visit https://groups.google.com/d/optout.