Pi to T and T to Pi Transformations (et alii)

Here is some valuable information!  Our professor asked us to derive the transformations for each of the impedance, admittance, hybrid, and transmission parameters.  He also asked us to derive the transformations going from T (Wye) to Pi (delta) and vice versa.  My buddy gave his to me to post here; they look way better than mine.  His name is Leandro Hormaza and he's a pretty smart dude.

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Y to H and H to Y

H to z and z to H

H to T and T to H

T to Y and Y to T

z to T and T to z

Y to z and z to Y

T to Pi

T to Pi cont.

T to Pi cont.

Pi to T

Pi to T cont.

Pi to T cont.