User blog comment:B1mb0w/J Function Sandpit J 0/@comment-26428969-20150919115235/@comment-10262436-20150919124307

The x and y notation serves no purpose. I am just trying to illustrate that the input parameters m and n are processed extensively in the program code to calculate the ordinal and the power of the FGH f function. So x and y are black box functions and placeholders for the ordinal and power.