Sir, – JS Bell's magnificent insight applies only to measurements on properties that are connected in what is termed Hilbert's space. Paul Gillespie's extension to European nationalist entanglements ("Quantum insight can affect economics", January 2nd), while ensuring good copy, has no basis in the either the intellectual or philosophical framework in which Bell's inequality operates. – Yours, etc,
Prof EAMONN F HEALY,
St Edward’s University,
Austin,
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Texas.
Sir, – I don’t know what economists hope to gain by trying to apply quantum theory to the economy. But I do know physicists don’t try to apply economic theory to the atom. – Yours, etc,
STUART McLAREN,
Oranmore,
Co Galway.