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Published online by Cambridge University Press: 14 March 2016
Page 190, to the alinea (beginning with): “the sole condition to be satisfied, is,” &c. (ending with): “… the versor of the expression may then become what it may,” add:
provided this versor does not differ from the versor of the product
made by successive multiplication (according to the definition of multiplication of more than two vectors), the quaternions w + ω, w−ω being likened respectively to the products
by a proper choice of the vectors p and .