convergent thinking
41Logic and the philosophy of mathematics in the nineteenth century — John Stillwell INTRODUCTION In its history of over two thousand years, mathematics has seldom been disturbed by philosophical disputes. Ever since Plato, who is said to have put the slogan ‘Let no one who is not a geometer enter here’ over the… …
42Mathematics of radio engineering — A complex valued function. The mathematics of radio engineering is a pleasant and very useful subject. This article is an attempt to provide a reasonably comprehensive summary of this almost limitless topic. While the ideas have historically… …
43Richard Feynman — Feynman redirects here. For other uses, see Feynman (disambiguation). Richard P. Feynman Richard Feynman at Fermilab Bor …
44Plate tectonics — The tectonic plates of the world were mapped in the second half of the 20th century …
45Trigonometric integral — Si(x) (blue) and Ci(x) (green) plotted on the same plot. In mathematics, the trigonometric integrals are a family of integrals which involve trigonometric functions. A number of the basic trigonometric integrals are discussed at the list of… …
461 + 2 + 4 + 8 + · · · — In mathematics, 1 + 2 + 4 + 8 + hellip; is the infinite series whose terms are the successive powers of two. As a geometric series, it is characterized by its first term, 1, and its common ratio, 2. :sum {i=0}^{n} 2^i.As a series of real numbers… …
47earth — /errth/, n. 1. (often cap.) the planet third in order from the sun, having an equatorial diameter of 7926 mi. (12,755 km) and a polar diameter of 7900 mi. (12,714 km), a mean distance from the sun of 92.9 million mi. (149.6 million km), and a… …
48Cetacean intelligence — denotes the cognitive capabilities of the Cetacea order of mammals, which includes whales, porpoises, and dolphins. Contents 1 Brain size 2 Brain structure 3 Problem solving ability …
49United States — a republic in the N Western Hemisphere comprising 48 conterminous states, the District of Columbia, and Alaska in North America, and Hawaii in the N Pacific. 267,954,767; conterminous United States, 3,022,387 sq. mi. (7,827,982 sq. km); with… …
50Darwin's Dangerous Idea — For the PBS documentary, see Evolution (TV series). Darwin s Dangerous Idea   …
