I'm afraid even the Monday Perth Mod sessions are now shut down. I may be able to resurrect the sessions at UWA after next week. I'll let you know. Hopefully, the sessions at Perth Mod can be started again in 2 weeks, when next term starts.
In the meantime, we did record two solution variations for AMO 2020 Q4 and they are on youtube at
AMO 2020 Q4 (28 min 6s)
AMO 2020 Q4 (Ver 2) (36 min 54s)
The second version requires some background on Pell's equation, which I hope to record at some stage.
Also, as Keith pointed out, I had a typo. in my recorded solution for AMO 2020 Q3, ... on the second line of the proof:
It should read '==> CE || AH' ... i.e. replace B by E.
I reiterate what I said in the earlier email:
... I plan to record more mini i-lectures for
Let me know what you'd like prioritised. If you have a better or otherwise insightful solution… please send it to me in an email, and I'll re-record or record it as an alternative solution.
Particularly, the new students, should keep trying problems from where they are up to in the notes, and send solution attempts as a JPEG or PDF, and I'll send you back my critiques and suggestions for what problems to try next.