What is the transfer function of the filtfilt command?

What is the transfer function of the filtfilt command?

[Star Strider]

It is possible to use transfer function notation with filtfilt, however the question unfortunately makes no sense.

What is your actual question?

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[studentmatlaber]

I first designed parks-mcclellan filter for signals (firpmord-firpm). Then with your help I filtered it with the filtfilt command. Now I have to explain what I have done both verbally and mathematically. What is the mathematical equivalent of the firpmord and firpm commands? I need to find the mathematical equivalent of the input-output relationship of the filfilt function.