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What is the origin of the four cardinal directions (North, East, … The opposite direction to this is called South. South is also the direction to the Sun in the middle of its daily way over the sky. These directions are of fundamental importance. East-West are perpendicular directions (in the horizontal plane). East to …
mathematics - Emergence of line bundle - History of Science and ... 9 Jan 2025 · In short the "büschel" is the family of curves that share a tangent plane at a point. This point construction is locally connected by being able to integrate the Pfaffian in the direction of the curves in the "büschel": On the surface (pun intended) this is very much what we want from a …
reference request - Why the word "equinox"? - History of Science … 21 Mar 2025 · 1) is self-explanatory. 2) is explained by the fact that Proto-West-Germanic *ebnnacht is a calque from the Latin "aequinoctis", which indicates that the word appeared during the Roman time, probably around III century AD. About 3) I'm not sure, but suppose that it is the original Proto-North Germanic word.
electricity - Where did the names positive and negative for the … 19 Apr 2020 · Later, when electric batteries were discovered, scientists naturally assigned the direction of the flow of current to be from (+) to (-). A century after that electrons were discovered and it was suddenly realized that in metal wires the electrons were the ones that carried the current, moving in exactly the opposite direction.
Did Grothendieck have any thoughts on foundations of … 5 Jul 2024 · Does the practice of viewing modern mathematics as the necessary direction in which ancient mathematics must have evolved have a name? 1 Did Rene Descartes send or receive any letters (regarding mathematics) on 18.v.1638 (May 18, 1638)?
Negative coefficients in the barycentric calculus 1 Dec 2023 · The Wikipedia article Barycentric coordinate system states: In geometry, a barycentric coordinate system is a coordinate system in which the location of a point is specified by reference to a simplex (a triangle for points in a plane, a tetrahedron for points in three-dimensional space, etc.).
astronomy - How was longitude determined in the 1700s? 25 Jan 2022 · Difference of nine hours slow – I suppose this is to put his watch time back to GMT (he's near the west coast of North America), not sure why he's adding 8 to the seconds column He observes an emersion of Jupiter's third satellite (some time later, at night) and finds in a table the exact GMT time that it should occur at.
How did the idea of a formal derivation emerge? - mathematics 13 Mar 2021 · $\begingroup$ Finite fields aside, the idea of detecting double roots of polynomials by using (formal) derivatives predates infinitesimal calculus.
Were European algebraists aware of the work of Al-Khwarizmi? 20 Sep 2024 · Were European algebraists, such as Cardano, del Ferro, Tartaglia, Viete, and Fermat, aware of the work of Al-Khwarizmi? If yes, what impact did it have? If not: Where did they learn to solve the
What is the idea behind Maxwell's "displacement current" in ... 24 Jul 2019 · $\begingroup$ Thanks! i just want to assure i understand your answer - the name "displacement current" for displacement current in a vaccum was chosen because it behaves like a polarization current in a dielectric (caused by "displacement" of electric charge across the dielectric mass); i.e both (dielectric matter and vaccum) respond to time-varing electric fields …