A delightful irony of history, given Baron Cauchy's Legitimist views! Cauchy was nevertheless commemorated in 1989 as well, with a stamp and envelopes bearing his likeness. As the design shows, it was Cauchy the analyst who was honored, with figures from integral calculus and the Cauchy integral formula, a fundamental result in complex analysis (see the article "The origins of complex analysis") that, in particular, expresses the value of a function at a point as the average of its values on a circle centered at that point.
First-day cover for the stamp commemorating
the bicentenary of Cauchy's birth.
