INTERVALS

CLOSED INTERVAL

•Every real number bigger than or equal to "a" and smaller than or equal to "b"

OPEN INTERVAL

•Every real number bigger than "a" and smaller than "b"

A HALF-OPEN INTERVAL•Every real number bigger(or equal to) than "a" and smaller(or equal to)than "b"

SUMMARY

LEFT OR RIGHT-UNBOUNDED

WE USE INFINITE ENDPOINTS TO INDICATE THAT THERE IS NO BOUND IN THAT DIRECTION

LEFT-OPEN(LEFT-CLOSED)

•Every real number bigger(or equal to) than "a"

RIGHT-OPEN(RIGHT-CLOSED)

•Every real number smaller(or equal to) than "b"

TORTURE IS FINISHED!!!!😓😓😓😓

Practice: www.mathsisfun.com/sets/

intervals.html