Crossword puzzle clue "null set theory concept"

Here are the possible solutions for null set theory concept clue

Answer
Clue
Relevancy
aleph
Clue
___ null (set theory concept)
___ number (set theory concept)
___-null (the number of natural numbers)
Definition
(Hebrew) the first letter of the Hebrew alphabet, also ALEF
paula
Clue
2014 Robin Thicke concept album (if "maybe stalking can win my wife back?" is a concept)
empty
Clue
Like the null set
Definition
to remove the contents of
zero
Clue
Number of items in a null set
zerosumgame
Clue
Concept in economic theory
abrogate
Clue
Declare null
Definition
to repeal (a law, custom, etc.); to abolish authoritatively or formally

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