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" Quantities, or those whose values are given, when not expressed by figures, are usually represented by the first letters of the alphabet, as a, b, c. "
A Complete Arithmetic ... - Σελίδα 159
των Frank H. Hall - 1899 - 447 σελίδες
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A Treatise on Fluxions ...

Colin MacLaurin - 1801
...that is, whether x increases or decreases with respect to the other fluents. Invariable quantities are represented by the first letters of the alphabet, as a, b, c, &.C.. These have no fluxions ; and, in the same manner, when any fluxion is supposed constant, its...

Mathematics: Compiled from the Best Authors and Intended to be the ..., Τόμος 1

1801 - 426 σελίδες
...or universal way of computation. 2. In Algebra, the given, or known, quantities are usually denoted by the first letters of the alphabet, as a, b, c, d, &c. and the unknown, or required quantities, by the last letters, as x,y,z. NOTE. The signs, or characters,...

A Philosophical and Mathematical Dictionary: Containing an ..., Τόμος 2

Charles Hutton - 1815 - 628 σελίδες
...quantities are either given and known, or else they are unknown and sought. The given or known quantities are usually represented by the first letters of the alphabet, as a, b, c, d, e, &c, and the unknown or required quantities, by the" last letters, as z, y, x, w, &c. and also indeterminate,...

A New Introduction to the Science of Algebra...

Silas Totten - 1836 - 304 σελίδες
...it is proposed to determine others which are Tinknown ; and it is usual to express known quantities by the first letters of the alphabet, as a, b, c, d, &c., and unknown quantities by the last, as x, y, z, t, u, &c. The signs which denote algebraic operations...

The elements of algebra

Andrew Bell (writer on mathematics.) - 1839
...and unknown quantities are those whose numerical values are not known. Known quantities are commonly represented by the first letters of the alphabet, as a, b, c, ; and unknown quantities by the last letters, as x, y, z, (13.) The sign of equality, =, enunciated...

First Lessons in Algebra, Being an Easy Introduction to that Science ...

Ebenezer Bailey - 1842 - 252 σελίδες
...either are, or are. supposed to be, determined, by letters. These are called known quantities, and are usually represented by the first letters of the alphabet, as a, b, c. 2. John is four times as old as James, and the sum of their ages is 20 years. What is the age of each...

Ray's Algebra, Part First: On the Analytic and Inductive Methods of ..., Μέρος 1

Joseph Ray - 1848 - 240 σελίδες
...quantities are those whose numerical values are not known. ART. 17. Known quantities are generally represented by the first letters of the alphabet, as a, b, c, &c.; and unknown quantities by the last letters, as x, y, z. ART. 18. The following are the principal...

Ray's Algebra, Part First: On the Analytic and Inductive Methods of ...

Joseph Ray - 1848 - 240 σελίδες
...quantities are those whose numerical values are not known. ART. 17. Known quantities are generally represented by the first letters of the alphabet, as a, b, c, &c.; and unknown quantities by the last letters, as x, y, z. ART. 18. The following are the principal...

Ray's Algebra Part Second: An Analytical Treatise, Designed for High Schools ...

Joseph Ray - 1852 - 396 σελίδες
...letters, and signs. The letters and signs are often called symbols. ART. 6. Known quantities are generally represented by the first letters of the alphabet, as a, b, c, &c. ; and unknown quantities by the last letters, as t, v, x, y, z. ART. 7. The principal signs used...

Examination essentials

John Robertson (LL.D., of Upton Park sch.) - 1861
...application far more extensive. Quantities whose values are known or determined are usually expressed by the first letters of the alphabet, as a, b, c, d, fyc. ; and unknown or undetermined quantities by the last, as x, y, z, fyc. The characters +, —,...




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