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Published online by Cambridge University Press: 18 August 2016
page 110 note * For let r be the period anticipated, A (an annuity to commence at the end of 2r) + .5 is its value = (1 + A p ) × t, a fraction generally nearly equal to unity; then A p t=annuity deferred for period of r = (l + A p )t – 1 nearly.=A + .5 –1=A–.5.