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** <math>f(c^-) \neq f(c^+)</math>;
** <math>f(c^-) \neq f(c^+)</math>;
** <math>f(x)</math> is not defined for the case of <math>x = c</math>; or
** <math>f(x)</math> is not defined for the case of <math>x = c</math>; or
** <math>f(c)</math> has a defined value, which, however, does not match the value of the two limits.
** <math>f(c)</math> has a defined value, which, however, does not match the value of the two limits.
f（c−）≠f（c+）
当x=c时，f（c−）没有定义；或
当x=c时，f（c−）没有定义；或