Dear all,
A talk about Harrington’s notes on “the hyperdegrees of reals in pruducts of uncountable Σ11 sets ” is going to be delivered by Yongyuan Yu at 4:00pm, 27 April (GMT, 8:00am), Zoom ID：485 023 3793 password：112233
You are welcome to attend in the talk.
Best,
Liang