AP BC Calc Notation Memorization

∀

for every

∃

there exists

∴

therefore

∍

such that

∈

is a member of (or is an element of)

∉

is not a member of (or is an element of)

∅ or { }

empty set

{x | x > 0 }

the set of all x values such that x is greater than 0

N

the set of all natural numbers: 1, 2, 3….

Z

the set of all integers -3 -2 -1 0 1 2 3

Z+

the set of all positive integers 1 2 3

Z-

the set of negative integers -3 -2 -1

Q

the set of rational numbers (ratios of integers)

I

the set of irrational numbers

R

the set of all real numbers (q U i)

R+ and R-

the sets of all positive and negative real numbers