"Let ε<0."
Or a similar but more blatant telling of the original joke would be "Let ℵ₀ be a group."
Or a similar but more blatant telling of the original joke would be "Let ℵ₀ be a group."
Our real analysis lecturer once put this question on the blackboard (with sum as the proper scientific sum notation).
Even though we all knew the answer as trivial it took most of us some time to figure it out in such screwy notation (his point was that our mind is not invariant WRT notation, do not make up monsters when the normal schemas exist)
I teach basic Maths to adults in the UK, so I tend to use these old faves...
"What did the zero say to the eight?"
"Nice belt"
(even my sister has heard that one)
"Why does noone talk to circles?"
"There's no point"
Thankyou and goodnight
Because seven eight nine.
Never grep a yacc by the inode.