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e (mathematical constant)

Euler

Leonhard Euler

Euler | Leonhard Euler biography and mathematics - LeonhardEuler.com

Euler's Identity - a popular tattoo

Euler Polynomials

Leonhard Euler 1707 - 1783

Euler Sudoku The symbols e, π, i, 0, 1, f, Σ, φ, and γ must each appear exactly once in each row, column, and 3x3 block. (Euler may have invented sudoku)

Recurrence plot

Computational complexity theory

What is the Singularity - String Theory

## Euler–Mascheroni constant