Union of all closed intervals contained in the open interval (0,1)

[@aluink]

In, F do you need to also restrict a

[@oceansofmath4732]

Great point! Yes I am taking it to be implied in the notation, but probably could have mentioned this explicitly! Thanks

[@skatethe4881]

Before watching, is it the superset? 0:03

[@skatethe4881]

Dunning meet Krueger, I'm not ready for Z-F xD