this post was submitted on 17 Jun 2025
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Is it actually? I'll admit im pretty rusty on time complexity, but naively I'd think that pi being irrational would technically make even reading or writing it from memory an undecidable problem
If you're trying to calculate it, then it's quite difficult.
If you just want to use it in a computer program, most programming languages have it as a constant you can request. You get to pick whether you want single or double precision, but both are atomic (a single instruction) on modern computers.
Do said atomic instructions produce pi though, or some functional approximation of pi? I absolutely buy that approximate pi is O(1), but it still seems like a problem involving a true irrational number should be undecidable on any real turing machine
There is no way of producing pi as a number. There aren't enough atoms in the visible universe to write out pi in an 8 bit font. There aren't enough atoms to write out pi in binary with atoms representing ones and empty space representing zeros