Journal article 1030 views
Meadows and the equational specification of division
Theoretical Computer Science, Volume: 410, Issue: 12-13, Pages: 1261 - 1271
Swansea University Author:
John Tucker
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DOI (Published version): 10.1016/j.tcs.2008.12.015
Abstract
The rational, real and complex numbers with their standard operations, including division, are partial algebras specified by the axiomatic concept of a field. Since the class of fields cannot be defined by equations, the theory of equational specifications of data types cannot use field theory in ap...
| Published in: | Theoretical Computer Science |
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| ISSN: | 0304-3975 |
| Published: |
Amsterdam
Elsevier
2009
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| Online Access: |
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| URI: | https://cronfa.swan.ac.uk/Record/cronfa7203 |
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| Abstract: |
The rational, real and complex numbers with their standard operations, including division, are partial algebras specified by the axiomatic concept of a field. Since the class of fields cannot be defined by equations, the theory of equational specifications of data types cannot use field theory in applications to number systems based upon rational, real and complex numbers. We study a new axiomatic concept for number systems with division that uses only equations: a meadow is a commutative ring with a total inverse operator satisfying two equations which imply 0−1=0. All fields and products of fields can be viewed as meadows. After reviewing alternate axioms for inverse, we start the development of a theory of meadows. We give a general representation theorem for meadows and find, as a corollary, that the conditional equational theory of meadows coincides with the conditional equational theory of zero totalized fields. We also prove representation results for meadows of finite characteristic. |
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| Keywords: |
Totalized fields; Meadow; Division-by-zero; Total versus partial functions; Representation theorems; Initial algebras; Equational specifications; von Neumann regular ring; Finite meadows; Finite fields |
| College: |
Faculty of Science and Engineering |
| Issue: |
12-13 |
| Start Page: |
1261 |
| End Page: |
1271 |