Fear of commitment non-marriage is an entirely valid, logical position based on rational consideration of the economic factors involved. Fear of commitment In self-help literature, fear of commitment is the avoidance of long-term partnership or marriage. The concept is often much more pervasive, affecting school, work, and home life as well. The term "commitmentphobia" was coined in the popular self-help book "Men Who Can't Love" in 1987. Following criticism of the perceived sexist idea that only men were commitmentphobic, the authors provided a more gender balanced model of commitmentphobia in a later work, " He's Scared, She's Scared" (1995). When aversion to marriage
Proof that π is irrational Proof that π is irrational In the 1760's, Johann Heinrich Lambert proved that the number (pi) is irrational: that is, it cannot be expressed as a fraction "a"/"b", where "a" is an integer and "b" is a non-zero integer. In the 19th century, Charles Hermite found a proof that requires no prerequisite knowledge beyond basic calculus. Three simplifications of Hermite's proof are due to Mary Cartwright, Ivan Niven, and Nicolas Bourbaki. Another proof, which is a simplification of Lambert's proof, is due to Miklós Laczkovich. In 1882, Ferdinand von Lindemann proved that is not just irrational, but transcendental as well.