M = N constructs a boolean expression which tests if M and N are equal as MultiSets, under evaluation either explicity via evalb or implicitly as the test of a conditional, such as an if ... then ... end if statement.

M <> N similarly tests for inequality of MultiSets.

At least one argument must be a MultiSet for this routine to be invoked.  Any other argument which is expected to be a MultiSet can be a MultiSet, a set or a list; in the latter two cases the argument is converted to a MultiSet before proceeding to evaluate this command.  IsGeneralized(M) must return the same value for all MultiSet arguments M, and all non-MultiSet arguments will be promoted to MultiSets with this same property.

$M≔\mathrm{MultiSet}\left(a=2\&comma;b=5\right)$

$M≔\left\{\left[a\&comma;2\right]\&comma;\left[b\&comma;5\right]\right\}$

$N≔\mathrm{MultiSet}\left(M\right)$

$N≔\left\{\left[a\&comma;2\right]\&comma;\left[b\&comma;5\right]\right\}$

$\mathrm{evalb}\left(M=N\right)$

$\mathrm{true}$

$\mathrm{Remove}\left(N\&comma;b\&comma;2\right)$

$3$

$N$

$\left\{\left[a\&comma;2\right]\&comma;\left[b\&comma;3\right]\right\}$

$\mathrm{evalb}\left(M\ne N\right)$

$\mathrm{true}$

$\mathrm{evalb}\left(N=\left[a\&comma;b\&comma;a\&comma;b\&comma;b\right]\right)$

$\mathrm{true}$

The MultiSet/= and MultiSet/<> operators were introduced in Maple 2016.

For more information on Maple 2016 changes, see Updates in Maple 2016.