Apparently ASCII doesn't work in here, either. (I copied the ASCII chart from work and have kept a copy in a folder since I retired in 1992.) In case anyone's interested and has a computer that can translate it, "pi" is: [Alt} plus keypad [227] (minus the brackets, of course.) The "Birthday Problem" is actually a basic form of calculus in its simplest form. (You don't really need calculus for this: this is just probability theory, which can be solved with algebra.) We also get to make some assumptions that may not always be true: namely that there are no twins, triplets, or other multiple birth siblings in the group, and that nobody was born on Feb. 29. The whole process is explained thoroughly in any good encyclopedia, advanced algebra text, or good ol' Google.
I worked with "i" frequently in the electric company's engineering department. (I had the title of "Associate Distribution Engineer", but I was far from being a real, card-carrying professional engineer--I was a glorified teacher's assistant, as it were. I did design such things as wiring layouts and necessary transformers, switches, etc. for residential subdivisions and such.) Imaginaries (square root of -1) came in with alternating current and capacitors. But mostly I just assigned work to the estimators and checked their work for errors.
