Treating polynomials as abstract symbolics entities (rather than as a formula into which you substitute a real number for x.
Q: What do you get when you multiply (1-x) by (1+x+x2+x3+...) ?
A: You get 1. Thus 1/(1-x)=(1+x+x2+x3+...).
I work in the Google cloud now. Previously I worked in the Oracle cloud and before that I was research faculty at MIT, and Chief Architect at Tokutek. Before that I worked at Akamai, was a Yale CS professor, and worked at Thinking Machines.
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