Details

This message is generated when the same name is used to specify two variables that are required to be distinct.
Off[message] switches off the message; On[message] switches it on. For example: Off[General::dupv].

Examples

The same symbol is used in both of the range specifications in this input to NDSolve:

Wolfram Language code:

NDSolve[{Derivative[2, 0][f][x, t] == Derivative[0, 1][f][x, t], f[0, t] == 0, f[1, t] == 1, f[x, 0] == x ^ 2}, f, {x, 0, 1}, {x, 0, 1}]

This shows valid input to NDSolve:

Wolfram Language code:

NDSolve[{Derivative[2, 0][f][x, t] == Derivative[0, 1][f][x, t], f[0, t] == 0, f[1, t] == 1, f[x, 0] == x ^ 2}, f, {x, 0, 1}, {t, 0, 1}]

The same symbol is used for both variables of integration:

Wolfram Language code: NIntegrate[x y, {x, 0, 1}, {x, 0, 1}]

This shows valid variable specifications in NIntegrate:

Wolfram Language code: NIntegrate[x y, {x, 0, 1}, {y, 0, 1}]

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