View Updating and Relational Theory by C.J. Date

Author:C.J. Date [C.J. Date]
Language: eng
Format: epub, pdf
Tags: COMPUTERS / Data Modeling & Design
ISBN: 9781449357795
Publisher: O'Reilly Media
Published: 2012-12-20T16:00:00+00:00

Symmetry

I believe symmetry is a good design principle in general. To quote Polya:

“If a problem is symmetric in some ways we may derive some profit from noticing its interchangeable parts and it often pays to treat those parts which play the same role in the same fashion … Try to treat symmetrically what is symmetrical, and do not destroy wantonly any natural symmetry” (George Polya: How To Solve It, 2nd ed., Princeton University Press, 1971).

“We expect that any symmetry found in the data and condition of the problem will be mirrored by the solution … Symmetry should result from symmetry” (George Polya: Mathematical Discovery: On Understanding, Learning, and Teaching Problem Solving, 2nd ed., John Wiley & Sons, 1981).

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