Symbol	Meaning	Symbol	Meaning
=	is equal to		is not equal to
	is less than or equal to		is greater than or equal to
	is equivalent to		is approximately equal to
	is congruent to		infinity
	therefore		since
	is an element of		is not an element of
	union of		intersection
	is a subset of		is not a subset of
	angle		is perpendicular to
	sum		square root
	pi		theta
	equivalence of two sets		vector from A to B or ray AB
	notation for a set		line segment or interval AB
	length measure of segment AB	(a,b)	open interval a<x<b
||	magnitude of vector from A to B	[a, b]	closed interval

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