Consider: a "derivative of a party" is the amount of alcoholic beverages that can be procured using the deposit on bottles and cans emptied on said party.
Posit: a "good party" can be defined as a party whose second order derivative is non-zero.
Corollary: my housewarming party was a good party.
@rysiek Więc jest to warunek dostateczny, a nie konieczny ;)
@jacek w rzeczy samej. :)
@rysiek One alternate definition:
It's not a real party until the cops come. 😀
@mkb why would I invite cops? :P
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