Details

This message is generated when Coefficient or Exponent is used with more than one variable.
Since Coefficient and Exponent have the Listable attribute by default, this message is typically seen only if the Listable attribute has been cleared or is not used.
Off[message] switches off the message; On[message] switches it on. For example: Off[Coefficient::numv].

Examples

An error occurs in this example because Exponent is used with more than one variable:

If the arguments have the same length, only one variable is used at a time:

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