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The equation

THE EQUATION
This can be found on page 336 of Narrow Roads of Gene Land by W. D. Hamilton

ISBN 0-7167-4530-5 the 96 Paperback edition

The fragment of equation on our heroine's handbag

Represents the criterion for the positive selection of altruism within a gene pool.

AN ANTIDOTE
"Alas poor Darwin" edited by Hilary & Steven Rose, ISBN 0-224-06030-9