One-sided limits help us talk about limits. {{CMD_244}}{{CMD_245}}{{CMD_246}} A limit {{MATH_247}} exists if and only if {{CMD_248}} {{CMD_249}} {{MATH_250}} exists {{CMD_251}} {{MATH_252}} exists {{CMD_253}} {{MATH_254}} {{CMD_255}} In this case, {{MATH_256}} is equal to the common value of the two one sided limits. {{CMD_257}}