The difference between logic and argument lies in how they relate to redundancy. For logic, redundancy is bloat, and a damper. For argument, redundancy is standard essential fare.
Pressing the envelope is never done on autopilot. It takes personal realtime attention.
Some things are absolutely beneficial. Other things are beneficial only if you survive them. (cf: Nietzsche’s “Whatever doesn’t destroy you makes you stronger.”)
lim sup and lim inf are ways of deleting the initial segment of a sequence.
Sought pleasures undermine timelessness. (cf: Bob Greene’s “Never travel for food.”)
A strictly mathematical set (as opposed to a multiset) is a set for which the notion of ‘subset’ makes sense.