I appreciate your love affair with big honking vertical pipes, but so far you have used ‘1’, occasionally in slightly different fonts, in one lecture, to represent:[list=1][li]An identity morphism (which may or may not be a functor)[/li][li]An identity functor (which may or may not be a morphism)[/li][li]A point set[/li][li]A terminal object (which may turn out to be a point set)[/li][li]The open point of Sterpinski space.[/li][/list=1]What was in your mind when, having four uses of ‘1’ already, you chose it to represent an arbitrary point in a space? *WITH THE POSSIBLE EXCEPTION OF ‘=’ or ‘{’ WHAT SYMBOL COULD POSSIBLY BE MORE FREAKING CONFUSING?*

We apologise for the geekiness of this rant. Stay tuned for ‘When we said stop writing n like m and m like rm, we didn’t mean write both as m’ and ‘Actually, no I don’t find that obvious.’