Details

This message is generated for typeset input when an integration operator is used without a corresponding differential operator.
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 for ordinary definite and indefinite integration.
An alternate form of integration does not use differential operators. Instead, the variables of integration belonging to a geometric region are indicated as .
You can use buttons from the Basic Math Assistant palette, the Classroom Assistant palette, or other palettes to enter integrals. Standard palettes can be accessed from the Palettes menu.
Off[message] switches off the message; On[message] switches it on. For example: Off[Integrate::nodiffd].

Examples

This input includes an integral sign without a corresponding differential operator; when this error occurs, the input is not evaluated:

This shows a correctly typeset integral:

This input includes a a definite integral sign without a corresponding differential operator; when this error occurs, the input is not evaluated:

This shows a correctly typeset integral:

An alternate version that uses regions instead of differentials:

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