From bc851a5995c8cb840e09e651de335ae69123ae2c Mon Sep 17 00:00:00 2001 From: Racoonicorn Date: Thu, 15 Dec 2016 19:29:11 +0100 Subject: [PATCH] Update README.md --- README.md | 1 + 1 file changed, 1 insertion(+) diff --git a/README.md b/README.md index 2c7cffd..f98c432 100644 --- a/README.md +++ b/README.md @@ -4,6 +4,7 @@ An arithmetic derivative calculator that uses these simple formulas: * 0' = 1' = 0; * if n is a prime, n' = 1; * if n = ab (a and b > 1), n' = a'b + ab' +* (-n)' = -(n') More about arithmetic derivative: https://en.wikipedia.org/wiki/Arithmetic_derivative