# Mathematician:John Cedric Shepherdson

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## Mathematician

English mathematician who worked in ring theory and mathematical logic.

Co-designer (with Howard E. Sturgis) of the Unlimited Register Machine, a refinement of the Turing machine.

## Nationality

English

## History

- Born: 7 June 1926 in Huddersfield, Yorkshire, England
- Died: 8 January 2015 in Bristol, England

## Theorems and Definitions

## Publications

- 1947:
*On the Addition of Elements of a Sequence* - 1951:
*Inverses and Zero Divisors in Matrix Rings* - 1951:
*Well-ordered Sub-series of General Series*

- 1963:
*Computability of Recursive Functions*(*J. ACM***Vol. 10**,*no. 2*: pp. 217 – 255) (with H.E. Sturgis)