NCCollect[expr, aListOfVariables]

Aliases: NCC

Description: $NCCollect[expr,aListOfVariables]$ collects terms of expression $expr$ according to the elements of $aListOfVariables$ and attempts to combine them using a particular list of rules called $rulesCollect$. NCCollect is weaker than NCStrongCollect in that first-order and second-order terms are not collected together. NCCollect uses NCDecompose, and then NCStrongCollect, and then NCCompose.

Arguments: $expr$ is an algebraic expression. $aListOfVariables$ is a list of variables.

Comments / Limitations: While $NCCollect[expr,x]$ always returns mathematically correct expressions, it may not collect $x$ from as many terms as it should. If $expr$ has been expanded in the previous step, the problem does not arise. If not, the pattern match behind NCCollect may not get entirely inside of every factor where $x$ appears.