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2 天前 · The number π (/paɪ/; spelled out as "pi") is a mathematical constant that is the ratio of a circle's circumference to its diameter, approximately equal to 3.14159. The number π appears in many formulae across mathematics and physics. It is an irrational number, meaning that it cannot be expressed exactly as a ratio of two integers, although ...
3 天前 · Galileo di Vincenzo Bonaiuti de' Galilei (15 February 1564 – 8 January 1642), commonly referred to as Galileo Galilei (/ ˌ ɡ æ l ɪ ˈ l eɪ oʊ ˌ ɡ æ l ɪ ˈ l eɪ / GAL-il-AY-oh GAL-il-AY, US also / ˌ ɡ æ l ɪ ˈ l iː oʊ-/ GAL-il-EE-oh - , Italian: [ɡaliˈlɛːo ɡaliˈlɛːi]) or simply Galileo, was an Italian astronomer, physicist and engineer, sometimes described as a polymath.
1 天前 · Eugenics (/juːˈdʒɛnɪks/ yoo-JEN-iks; from Ancient Greek εύ̃ (eû) 'good, well', and -γενής (genḗs) 'come into being, growing')[1] is a set of beliefs and practices that aim to improve the genetic quality of a human population.[2][3][4] Historically, eugenicists have attempted to alter human gene pools by excluding people and ...
22 小時前 · In mathematics, the logarithm is the inverse function to exponentiation. That means that the logarithm of a number x to the base b is the exponent to which b must be raised to produce x. For example, since 1000 = 103, the logarithm base 10 {\displaystyle 10} of 1000 is 3, or log10 (1000) = 3. The logarithm of x to base b is denoted as logb (x ...
1 天前 · Visual comparison of convolution, cross-correlation, and autocorrelation.For the operations involving function , and assuming the height of is 1.0, the value of the result at 5 different points is indicated by the shaded area below each point. The symmetry of is the reason and are identical in this example. ...
1 天前 · The beginning of Aristotle's Metaphysics, one of the foundational texts of the discipline Metaphysics is the branch of philosophy that examines the basic structure of reality. It is often characterized as first philosophy, implying that it is more fundamental than other forms of philosophical inquiry. Metaphysics is traditionally seen as the ...
1 天前 · Etymology The origin of the word "Parthenon" comes from the Greek word parthénos (παρθένος), meaning "maiden, girl" as well as "virgin, unmarried woman".The Liddell–Scott–Jones Greek–English Lexicon states that it may have referred to the "unmarried women's apartments" in a house, but that in the Parthenon it seems to have been used for a particular room of the temple.
