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To the definition of an oval in a projective plane To the definition of an ovoid. In a projective plane a set Ω of points is called an oval, if: Any line l meets Ω in at most two points, and; For any point P ∈ Ω there exists exactly one tangent line t through P, i.e., t ∩ Ω = {P}.
A mass, according to Freud, is a "temporary entity, consisting of heterogeneous elements that have joined together for a moment." [ 1 ] He refers heavily to the writings of sociologist and psychologist Gustave Le Bon (1841-1931), summarizing his work at the beginning of the book in the chapter Le Bons Schilderung der Massenseele ("Le Bon's ...
To the definition of an ovoid: t tangent, s secant line. In projective geometry an ovoid is a sphere like pointset (surface) in a projective space of dimension d ≥ 3. Simple examples in a real projective space are hyperspheres . The essential geometric properties of an ovoid are:
This glossary of geography terms is a list of definitions of terms and concepts used in geography and related fields, including Earth science, oceanography, cartography, and human geography, as well as those describing spatial dimension, topographical features, natural resources, and the collection, analysis, and visualization of geographic ...
Cognitive geography is an interdisciplinary study of cognitive science and geography.It aims to understand how humans view space, place, and environment. It involves formalizing factors that influence our spatial cognition to create a more effective representation of space.
Psychogeography was originally developed by the Letterist International 'around the summer of 1953'. [4] Debord describes psychogeography as 'charmingly vague' and emphasises the importance of practice in psychogeographical explorations. [4]
An ovoid of () (a symplectic polar space of rank n) would contain + points. However it only has an ovoid if and only n = 2 {\displaystyle n=2} and q is even. In that case, when the polar space is embedded into P G ( 3 , q ) {\displaystyle PG(3,q)} the classical way, it is also an ovoid in the projective geometry sense.
Also called Indianite. A mineral from the lime-rich end of the plagioclase group of minerals. Anorthites are usually silicates of calcium and aluminium occurring in some basic igneous rocks, typically those produced by the contact metamorphism of impure calcareous sediments. anticline An arched fold in which the layers usually dip away from the fold axis. Contrast syncline. aphanic Having the ...