When Tony is trying to understand this father and his father's work, his place in that, he reexamines his dad's old notes. The elder Stark, from which the three main geniuses of the movie derive much of their life ("he's like a father to us all"), was apparently fond of scribbling down equations dealing with that effect.
They could get the same splitting/perturbations motif other ways, but, y'know, Stark. It's cute. Like the "make salute" (salyut, Russian for fireworks) or the bit about James Joyce writing in crayon.
Thanks THC! I clearly need to re-watch that movie! :-)
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