Details

This message is generated for typeset input when an integration operator with invalid limits or integration region is used.
Valid forms include ∫ for indefinite integration, for definite integration, and for integration over a region.
Off[message] switches off the message; On[message] switches it on. For example: Off[Integrate::malfop].

Examples

This integral sign has an upper limit but is missing a lower limit:

Wolfram Language code: ∫^bxⅆx

This shows a correctly typeset integral:

Wolfram Language code: Subsuperscript[∫, a, b]x ⅆx

The underscript is not of the form vars∈region, which is the only valid form for region integration:

Wolfram Language code: Underscript[∫, Interval[{0, 1}]](1/x^2 + 1)

This shows a correctly typeset integral:

Wolfram Language code: Underscript[∫, {x}∈Interval[{0, 1}]](1/x^2 + 1)

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