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p, q, r (propositions)

x, y, z (variables)

L (lamda operator)

P Q (transitive predicates)

~ (not)

<x,y> (relationship)

{x, y} (set)

& ("and" and intersection)

E (universal set)

# (existential quantifier "some")

@ (universal quantifier "all")

N (set of natural numbers)

n (variable for numbers)

< (subset)

> (superset)

e (is an element of)

Pow(D) (Powerset of D)

D (set of individuals)

any more will be appreciated.

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