Gregory's Formula
A series Leibniz, 
It converges very slowly, but its convergence can be accelerated using certain transformations, in particular
where
is the Riemann Zeta Function (Vardi 1991).See also Machin's Formula, Machin-Like Formulas, Pi
References
Vardi, I. Computational Recreations in Mathematica. Reading, MA: Addison-Wesley, pp. 157-158, 1991.
- Fermat Spiral Inverse Curve
- Fermat's Polygonal Number Theorem
- Fermat's Primality Test
- Fermat's Problem
- Fermat's Right Triangle Theorem
- Fermat's Sigma Problem
- Fermat's Simple Theorem
- Fermat's Spiral
- Fermat's Theorem
- Fermat's Two-Square Theorem
- Fermat Sum Theorem
- Fermi-Dirac Distribution
- Fern
- Ferrari's Identity
- Ferrers Diagram
- Ferrers' Function
- Ferrier's Prime
- Feuerbach Circle
- Feuerbach Point
- Feuerbach's Conic Theorem
- Feuerbach's Theorem
- Feynman Point
- FFT
- Fiber
- Fiber Bundle