It is very important to note that saying {{CMD_34}} ``a function {{MATH_35}} is continuous at a point {{MATH_36}}'' {{CMD_37}} is really making {{CMD_38}}three{{CMD_39}} statements: {{CMD_40}} {{CMD_41}} {{MATH_42}} is defined. That is, {{MATH_43}} is in the domain of {{MATH_44}}. {{CMD_45}} {{MATH_46}} exists. {{CMD_47}} {{MATH_48}}. {{CMD_49}}