Is there a subtraction operation defined for infinities of the cardinality C?
Conversation
Replying to
No that compares cardinality of reals vs countables. I'm after 2 uncountables
1
Replying to
Yeah. There's no well posed subtraction that doesn't create holes in one it seems
Replying to
"For any infinite sets A and B, if there is an injection from A to B then there is an injection from subsets of A to subsets of B" - or as my math friend says - it depends on your assumptions and definitions :)

