# Mathematician:William Henry Young

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## Mathematician

English mathematician, who worked on measure theory, Fourier series, differential calculus amongst other fields.

Made brilliant and long-lasting contributions to the study of functions of several complex variables.

## Nationality

English

## History

- Born: 20 Oct 1863, London, England
- 1896: Married Grace Emily Chisholm
- Died: 7 July 1942, Lausanne, Switzerland

## Theorems and Definitions

- Young's Inequality for Products
- Reverse Young's Inequality for Products
- Young's Inequality for Convolutions
- Young's Inequality for Increasing Functions
- Hausdorff-Young Inequality (with Felix Hausdorff)

Results named for **William Henry Young** can be found here.

## Publications

- 1905:
*The First Book of Geometry*(with Grace Chisholm Young) - 1906:
*The Theory of Sets of Points*(with Grace Chisholm Young) - 1910:
*The Fundamental Theorems of the Differential Calculus* - 1913:
*On the Fourier Series of Bounded Functions*(*Proc. London Math. Soc.***Ser. 2****Vol. 12**: pp. 41 – 70) - 1913:
*On the Determination of the Summability of a Function by Means of its Fourier Constants*(*Proc. London Math. Soc.***Ser. 2****Vol. 12**: pp. 71 – 88)