21 Jun Use a bracket to indicate that the endpoint is included in t
Use a bracket to indicate that the endpoint is included in the interval a parenthesis to indicate that it is not. Brackets are like inequalities that say or equal parentheses are like strict inequalities. ##(37)## includes ##3.1## and ##3.007## and ##3.00000000002## but it does not include ##3##. It also includes numbers greater than ##3## but it does not include 7. People sometimes say this is ##3## to ##7## exclusive (Excluding the endpoints) ##[4 9]## includes ##4## and every number from ##4## up to ##9## and it also includes ##9## People sometimes say this is ##4## to ##9## inclusive (Including the endpoints) ##(ab) = {x : a< x and x< b}####[ab] = {x : a<= x and x<= b}##Of course mixed intervals ##(ab]## or ##[ab)## are also possible.The symbols ##-oo## (and ##oo##) are used to indicate that there is no left (right) endpoint for the interval. They are not endpoints but indicators that there is no endpoint. They always take parentheses.Quick examples:Domain of ##f(x)=sqrtx## is ##[0 oo)##Domain of ##g(x)=1/sqrtx## is ##(0 oo)##
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