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delay-differential equation deleted space denumerable set derivation tree derivatives and primitive functions derived function descents and ascents desideratum determined system developable space dew point dextral and sinistral diagrammatic representation dictum de omni difference-differential equation difficulties in formulation diffraction grating Diophantine equations direct product directed family disk algebra dissection and valuations distance between x and y distinct elements ditto diurnal aberration divergent double series dogma, doctrine, and tenet dominant integral form Dominated Ergodic Theorem dormant idea double sequence dual space duality between X and X' dummy index duo-trio test Dupin indicatrix duxial set ecart eddy current/velocity Edge-of-the-Wedge Theorem efficiency, effectiveness, and efficacy efficiency frontier eigenvalue Einstein summation convention elemental truths and elementary particles ellipse ellipsis ellipsoid of revolution embedding and immersion empty set energy integral entourage entries, members, components, or terms of a sequence entry of/in a matrix enumeration of a code enveloping von Neumann algebra epigraph Epiphany, Easter, and Whitsun Epstein zeta function equalizer equally-spaced points equations in operators for x equilateral, isosceles, and right triangles equilibrium state Eratosphenes sieve Erlangen program erratum error detecting/estimate Escher tile et alia/et al. et alii/et al. et cetera/etc. etale extension and Henselization Euclid axiom Euclidean algorithm Euler characteristic ex falso quod libet exave excess demand exchange economy exegetics exempli gratia existence theorem existential quantifier exit time exotic sphere expansion as t ^ ж of f expansion of a vector in a basis expansive vs. expensive explanandum et explanans expose extended real axis extension by 0 of f to X extension to/onto all/the whole of X exterior product of differential forms external law of composition extremal quasiconformal mapping extreme point faces of alcoves factor group 142
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