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from article Combinatorial theory
Two orthogonal Latin squares for n = 10. (Courtesy of Thomas Brylawski; Karl Petersen, photographer)
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Image
from article Combinatorial theory
Subdivision of a square into 26 smaller squares; no two of which are the same size. (Photo courtesy of Thomas Brylawski; Karl Petersen, photographer)
Image
from article Delta electrons
Nuclear emulsion showing iron nucleus (Z = 26) in cosmic radiation entering from upper right and producing large numbers of delta electrons, giving its track a heavy, “hairy” appearance.
Image
from article Couple
Vector properties of a couple.
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from article Couple
Equivalent couples.
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from article Riemann surface
Riemann surface for zn. (After A. G. Sveshnikov and A. N. Tikhonov, The Theory of Functions of a Complex Variable, Mir Publishers, 1973)
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from article Riemann surface
Rolling up an ideal hyperbolic square. (After W. Dyck, Ueber Untersuchen und Aufstellung von Gruppe und Irrationalität regulärer Riemann'scher Flächen, Math. Ann., 17:473–509, 1880)
Image
from article Illumination
Spectral response of human eye to radiation. (After W. B. Boast, Illumination Engineering, 2d ed., McGraw-Hill, 1953)
Image
from article Illumination
Ideal reflection. (a) Specular, such as from a polished surface. (b) Diffuse, such as from a that surface of microscopic roughness. (After W. B. Boast, Illumination Engineering, 2d ed., McGraw-Hill, 1953)
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from article Illumination
Typical reflection characteristics. (a) Practical mat surface. (b) Semimat surface. (c) Semimat surface at large angle of incidence. (d) Porcelain-enameled steel. Broken-line curves in a and d illustrate ideal cosine distribution. (After W. B.…
