symbolicSlackMatrix(...,Vars=>...) -- specifies the variables to use to create the underlying ring of the matrix

Functions with optional argument named Vars:

cycleIdeal(...,Vars=>...) -- specifies the variables to use to create the underlying ring of the ideal
graphicIdeal(...,Vars=>...) -- specifies the variables to use to create the underlying ring of the ideal
reconstructSlackMatrix(...,Vars=>...) -- specifies the variables to use to create the underlying ring of the ideal
reducedSlackMatrix(...,Vars=>...) -- specifies the variables to use to create the underlying ring of the ideal
slackIdeal(...,Vars=>...) -- specifies the variables to use to create the underlying ring of the ideal
symbolicSlackMatrix(...,Vars=>...) -- specifies the variables to use to create the underlying ring of the matrix
universalIdeal(...,Vars=>...) -- specifies the variables to use to create the underlying ring of the ideal

Default value: {}
Function: symbolicSlackMatrix -- computes the symbolic slack matrix
Option key: Vars -- give a set of variables for the polynomial ring where the object created will live

The source of this document is in SlackIdeals.m2:2976:0.