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6 天前 · In mathematics, the cross product or vector product (occasionally directed area product, to emphasize its geometric significance) is a binary operation on two vectors in a three-dimensional oriented Euclidean vector space (named here ), and is denoted by the symbol .
4 天前 · Chaos theory is an interdisciplinary area of scientific study and branch of mathematics. It focuses on underlying patterns and deterministic laws of dynamical systems that are highly sensitive to initial conditions. These were once thought to have completely random states of disorder and irregularities. [1] .
1 天前 · Alzheimer's disease ( AD) is a neurodegenerative disease that usually starts slowly and progressively worsens, [2] and is the cause of 60–70% of cases of dementia. [2] [15] The most common early symptom is difficulty in remembering recent events. [1] .
2 天前 · Fyodor Dostoevsky, born on 11 November [ O.S. 30 October] 1821 in Moscow, was the second child of Dr. Mikhail Dostoevsky and Maria Dostoevskaya (born Nechayeva). He was raised in the family home in the grounds of the Mariinsky Hospital for the Poor, which was in a lower class district on the edges of Moscow. [13]
2 天前 · René Descartes ( / deɪˈkɑːrt / day-KART or UK: / ˈdeɪkɑːrt / DAY-kart; French: [ʁəne dekaʁt] ⓘ; [note 3] [11] 31 March 1596 – 11 February 1650) [12] [13] : 58 was a French philosopher, scientist, and mathematician, widely considered a seminal figure in the emergence of modern philosophy and science. Mathematics was paramount to ...
2 天前 · Sir Winston Leonard Spencer Churchill [a] (30 November 1874 – 24 January 1965) was a British statesman, soldier, and writer who was twice Prime Minister of the United Kingdom, from 1940 to 1945 during the Second World War, and 1951 to 1955.
2 天前 · Franklin Delano Roosevelt [a] (January 30, 1882 – April 12, 1945), commonly known by his initials FDR, was an American politician who served as the 32nd president of the United States from 1933 until his death in 1945. The longest serving U.S. president, he is the only president to have served more than two terms.
