Details

This message is generated for incorrect typeset input involving an unequal number of integral operators and differential operators.
The integral sign ∫ is used in typeset input to indicate integration. A differential operator of the form x is used to identify the variable of integration.
Multiple integrals can be entered using repeated integral signs and differential operators.
Off[message] switches off the message; On[message] switches it on. For example: Off[Integrate::intnest].

Examples

This input includes one integral sign and two differential operators; when this error occurs, the input is not evaluated:

Wolfram Language code: ∫xⅆxⅆx

A double integral can be indicated using matching integral signs and differential operators:

Wolfram Language code: ∫∫xⅆxⅆx

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