Kitten heel Kitten heel A kitten heel is a short, slender heel, usually from 3.5 centimeters (1.5 inches) to 4.75 centimeters (1.75 inches) high, with a slight curve setting the heel in from the back edge of the shoe. The style was popularized by Audrey Hepburn, and more recently by Theresa May, Michelle Obama, and Hillary Clinton. Shoes with kitten heels may be worn at work in an office setting by women who wish to wear feminine attire that is still practical. For parties, kitten heels are an alternative for women who find high heels uncomfortable. Further, kitten heels are also worn
On the Number of Primes Less Than a Given Magnitude On the Number of Primes Less Than a Given Magnitude " die Anzahl der Primzahlen unter einer gegebenen " (usual English translation: "On the Number of Primes Less Than a Given Magnitude") is a seminal 9-page paper by Bernhard Riemann published in the November 1859 edition of the "Monatsberichte der Königlich Preußischen Akademie der Wissenschaften zu Berlin". This paper studies the prime-counting function using analytic methods. Although it is the only paper Riemann ever published on number theory, it contains ideas which influenced thousands of researchers during the late 19th century and up to the present day. The paper consists