Book:David Nelson/The Penguin Dictionary of Mathematics/Second Edition/Errata

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Errata for 1998: David Nelson: The Penguin Dictionary of Mathematics (2nd ed.)

Directed Angle

Often an angle is regarded as the measure of the rotation involved in moving from one initial axis to another final axis (termed a direction angle).

Eugenio Beltrami

Beltrami, Eugenio (1835-99)

William Brouncker

Brouncker, William, Viscount (1620-85)

Edward Cocker

Cocker, Edward (1631-75)

Nikolai Ivanovich Lobachevsky

Lobachevsky, Nikolai Ivanovich (1793-1856)

Pietro Mengoli

Mengoli, Pietro (1626-82)

Emmy Noether

Noether, Amalie (Emmy) (1883-1935)

William Oughtred

Oughtred, William (1575-1660)


A hexagonal prism.

Willebrord van Royen Snell

Snell, Willebrord van Royen (1580-1626)

Alfred Tarski

Tarski, Alfred (1902-85)


It is named after the Polish mathematician Józef Maria Hoene-Wroński (1776-1853).

Primitive of $\sqrt {x^2 - a^2}$

$\ds \int \sqrt {x^2 - a^2} \rd x = \frac 1 2 a^2 \cosh^{-1} \frac x a + \frac 1 2 {x \sqrt {x^2 - a^2} } + C$