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Spectrum. A spectrum ( pl.: spectra or spectrums) [1] is a condition that is not limited to a specific set of values but can vary, without gaps, across a continuum. The word spectrum was first used scientifically in optics to describe the rainbow of colors in visible light after passing through a prism. As scientific understanding of light ...
Webster's International Dictionary (1890 and 1900) 1896 advertisement for the 1890 International edition. Porter also edited the succeeding edition, Webster's International Dictionary of the English Language (1890), which was an expansion of the American Dictionary. It contained about 175,000 entries.
Isotropy. In physics and geometry, isotropy (from Ancient Greek ἴσος (ísos) 'equal', and τρόπος (trópos) 'turn, way') is uniformity in all orientations. Precise definitions depend on the subject area. Exceptions, or inequalities, are frequently indicated by the prefix a- or an-, hence anisotropy.
Time geography. Time geography or time-space geography is an evolving transdisciplinary perspective on spatial and temporal processes and events such as social interaction, ecological interaction, social and environmental change, and biographies of individuals. [1] Time geography "is not a subject area per se", [2] but rather an integrative ...
Bessel's correction. In statistics, Bessel's correction is the use of n − 1 instead of n in the formula for the sample variance and sample standard deviation, [1] where n is the number of observations in a sample. This method corrects the bias in the estimation of the population variance. It also partially corrects the bias in the estimation ...
Central Park, New York City, US, designed by Frederick Law Olmsted. Landscape architecture is a multi-disciplinary field, incorporating aspects of botany, horticulture, the fine arts, architecture, industrial design, geology and the earth sciences, environmental psychology, geography, and ecology.
The Dictionary of Greek and Roman Biography and Mythology is a biographical dictionary of classical antiquity, edited by William Smith and originally published in London by Taylor, Walton (and Maberly) and John Murray from 1844 to 1849 in three volumes of more than 3,700 pages. It is a classic work of 19th-century lexicography.
Economic geography is the subfield of human geography that studies economic activity and factors affecting it. It can also be considered a subfield or method in economics. [1] There are four branches of economic geography.