Signs and symbols

glossary

¬

“it is not the case that”. or meaning a statement is false

∧

and

∧

or/either/ or both

∈

is an element of

∀

for all

∃

there exists (at least one)

→

if….

there…..

↔

If and only if…

a mod b = r

r is the remainder when a is divided by b.

Z

integer (…-1,0,1…)

Z⁺

positive integers (1,2,3,4…)

Z≥/ N

natural number (0,1,2,3)

Q

All rational numbers

Q⁺

positive rational numbers

Q≥

denotes non-negative rational numbers

R

Real numbers

R⁺

positive real numbers

R≥

set of non-negative real numbers.

|m|

absolute value

⊆

“is a subset of”

⊂

“is a proper subset of”

0/ (Line should strike through the o)

empty set

∩

intersection- means the the set at hand contains elements in common for two or more sets.

also commonly means and (probability defenition)

∪

union - means set at had contains all elements from both sets that are not common

also commonly means or (probability)