Bond convexity closed-form formula (Blake and Orszag):
D = coupon payment per period
P = present value (price)
B = face value
i = discount rate per period (half-year)
a = fraction of a period remaining until next coupon payment
m = number of coupon dates until maturity
Look up Bond duration closed-form formula
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—Emile Durkheim (1858–1917)
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—Aristotle (384–323 B.C.)