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The Big Bang theory was confirmed in 1929 by the American astronomer Edwin Hubble's analysis of galactic redshifts. [62] But the Big Bang theory had been presaged three-quarters of a century earlier in the American poet and short-story writer Edgar Allan Poe's then much-derided essay, Eureka: A Prose Poem (1848). [12] [63] [64]
4th century BC: Thaetetus enumerates the Platonic solids, an early work in graph theory. 4th century BC: Menaechmus discovers conic sections. [37] 4th century BC: Menaechmus develops co-ordinate geometry. [38] 4th century BC: Mozi in China gives a description of the camera obscura phenomenon.
The Lower Paleolithic period lasted over 3 million years, during which there many human-like species evolved including toward the end of this period, Homo sapiens.The original divergence between humans and chimpanzees occurred 13 (), however interbreeding continued until as recently as 4 Ma, with the first species clearly belonging to the human (and not chimpanzee) lineage being ...
Image credits: Isabella Thornton #2 An Early Motorised Scooter. The Autoped was an early vision of today's scooters. This was a personal transport system originally developed in 1915.
1864 – James Clerk Maxwell: A Dynamical Theory of the Electromagnetic Field (electromagnetic radiation) 1867 – James Clerk Maxwell: On the Dynamical Theory of Gases (kinetic theory of gases) 1871–89 – Ludwig Boltzmann & Josiah Willard Gibbs: Statistical mechanics (Boltzmann equation, 1872) 1873 – Maxwell: A Treatise on Electricity and ...
The 24-year-old from Brooklyn was the first to use a new technology called digitalization to capture images. Four decades later, we carry his invention in our pockets on our phones. Courtesy of ...
An undirected graph with three vertices and three edges. In one restricted but very common sense of the term, [1] [2] a graph is an ordered pair = (,) comprising: , a set of vertices (also called nodes or points);
In graph theory, two of Petersen's most famous contributions are: the Petersen graph, exhibited in 1898, served as a counterexample to Tait's ‘theorem’ on the 4-colour problem: a bridgeless 3-regular graph is factorable into three 1-factors and the theorem: ‘a connected 3-regular graph with at most two leaves contains a 1-factor’.