Symbols:Greek/Pi/Prime-Counting Function
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Prime-Counting Function
- $\map \pi x$
The prime-counting function is the function $\pi: \R \to \Z$ which counts the number of primes less than or equal to some real number.
That is:
- $\ds \forall x \in \R: \map \pi x = \sum_{\substack {p \mathop \in \mathbb P \\ p \mathop \le x} } 1$
where $\mathbb P$ denotes the set of prime numbers.
The $\LaTeX$ code for \(\map \pi x\) is \map \pi x .
Sources
- 2008: David Nelson: The Penguin Dictionary of Mathematics (4th ed.) ... (previous) ... (next): $\map \pi x$