• e (irrational number), 356, 388

  • Eccentricity, 593, 598

  • Echelon form, 166, 458

  • Edison, Thomas, 299, 365, 535

  • Einstein, Albert, 43

  • Electric circuits, 364

  • Element: of; of determinant, 159; of matrix, 440

  • Elimination by addition or subtraction, 154, 408

  • Ellipse, 404, 588, 599, 604

  • Empirical rule, 634

  • Engineering notation, 25

  • ENIAC, 213

  • Equations, 39; conditional, 39; exponential, 391; graphical solution, 103, 148; higher-degree, 421; involving fractions, 210; linear, 141; literal, 43; logarithmic, 391; parametric, 317, 614; polar, 611; polynomial, 427; quadratic, 220, 411; quadratic form, 411; with radicals, 414; roots of, 426, ­second-degree, 602; systems of linear, 147, 152, 164, 453, 463; systems of quadratic, 404, 408; trigonometric, 554

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