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2 definitions found
 for Calculus of functions
From The Collaborative International Dictionary of English v.0.48 :

  Function \Func"tion\, n. [L. functio, fr. fungi to perform,
     execute, akin to Skr. bhuj to enjoy, have the use of: cf. F.
     fonction. Cf. Defunct.]
     1. The act of executing or performing any duty, office, or
        calling; performance. "In the function of his public
        calling." --Swift.
        [1913 Webster]
     2. (Physiol.) The appropriate action of any special organ or
        part of an animal or vegetable organism; as, the function
        of the heart or the limbs; the function of leaves, sap,
        roots, etc.; life is the sum of the functions of the
        various organs and parts of the body.
        [1913 Webster]
     3. The natural or assigned action of any power or faculty, as
        of the soul, or of the intellect; the exertion of an
        energy of some determinate kind.
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              As the mind opens, and its functions spread. --Pope.
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     4. The course of action which peculiarly pertains to any
        public officer in church or state; the activity
        appropriate to any business or profession.
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              Tradesmen . . . going about their functions. --Shak.
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              The malady which made him incapable of performing
              regal functions.                      --Macaulay.
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     5. (Math.) A quantity so connected with another quantity,
        that if any alteration be made in the latter there will be
        a consequent alteration in the former. Each quantity is
        said to be a function of the other. Thus, the
        circumference of a circle is a function of the diameter.
        If x be a symbol to which different numerical values can
        be assigned, such expressions as x^{2, 3^{x}, Log. x, and
        Sin. x, are all functions of x.
        [1913 Webster]
     6. (Eccl.) A religious ceremony, esp. one particularly
        impressive and elaborate.
              Every solemn `function' performed with the
              requirements of the liturgy.          --Card.
        [Webster 1913 Suppl.]
     7. A public or social ceremony or gathering; a festivity or
        entertainment, esp. one somewhat formal.
              This function, which is our chief social event. --W.
                                                    D. Howells.
        [Webster 1913 Suppl.]
     Algebraic function, a quantity whose connection with the
        variable is expressed by an equation that involves only
        the algebraic operations of addition, subtraction,
        multiplication, division, raising to a given power, and
        extracting a given root; -- opposed to transcendental
     Arbitrary function. See under Arbitrary.
     Calculus of functions. See under Calculus.
     Carnot's function (Thermo-dynamics), a relation between the
        amount of heat given off by a source of heat, and the work
        which can be done by it. It is approximately equal to the
        mechanical equivalent of the thermal unit divided by the
        number expressing the temperature in degrees of the air
        thermometer, reckoned from its zero of expansion.
     Circular functions. See Inverse trigonometrical functions
        (below). -- Continuous function, a quantity that has no
        interruption in the continuity of its real values, as the
        variable changes between any specified limits.
     Discontinuous function. See under Discontinuous.
     Elliptic functions, a large and important class of
        functions, so called because one of the forms expresses
        the relation of the arc of an ellipse to the straight
        lines connected therewith.
     Explicit function, a quantity directly expressed in terms
        of the independently varying quantity; thus, in the
        equations y = 6x^{2, y = 10 -x^{3}, the quantity y is an
        explicit function of x.
     Implicit function, a quantity whose relation to the
        variable is expressed indirectly by an equation; thus, y
        in the equation x^{2 + y^{2} = 100 is an implicit
        function of x.
     Inverse trigonometrical functions, or Circular functions,
        the lengths of arcs relative to the sines, tangents, etc.
        Thus, AB is the arc whose sine is BD, and (if the length
        of BD is x) is written sin ^{-1x, and so of the other
        lines. See Trigonometrical function (below). Other
        transcendental functions are the exponential functions,
        the elliptic functions, the gamma functions, the theta
        functions, etc.
     One-valued function, a quantity that has one, and only one,
        value for each value of the variable. -- Transcendental
     functions, a quantity whose connection with the variable
        cannot be expressed by algebraic operations; thus, y in
        the equation y = 10^{x is a transcendental function of x.
        See Algebraic function (above). -- Trigonometrical
     function, a quantity whose relation to the variable is the
        same as that of a certain straight line drawn in a circle
        whose radius is unity, to the length of a corresponding
        are of the circle. Let AB be an arc in a circle, whose
        radius OA is unity let AC be a quadrant, and let OC, DB,
        and AF be drawnpependicular to OA, and EB and CG parallel
        to OA, and let OB be produced to G and F. E Then BD is the
        sine of the arc AB; OD or EB is the cosine, AF is the
        tangent, CG is the cotangent, OF is the secant OG is the
        cosecant, AD is the versed sine, and CE is the coversed
        sine of the are AB. If the length of AB be represented by
        x (OA being unity) then the lengths of Functions. these
        lines (OA being unity) are the trigonometrical functions
        of x, and are written sin x, cos x, tan x (or tang x), cot
        x, sec x, cosec x, versin x, coversin x. These quantities
        are also considered as functions of the angle BOA.

From The Collaborative International Dictionary of English v.0.48 :

  Calculus \Cal"cu*lus\, n.; pl. Calculi. [L, calculus. See
     Calculate, and Calcule.]
     1. (Med.) Any solid concretion, formed in any part of the
        body, but most frequent in the organs that act as
        reservoirs, and in the passages connected with them; as,
        biliary calculi; urinary calculi, etc.
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     2. (Math.) A method of computation; any process of reasoning
        by the use of symbols; any branch of mathematics that may
        involve calculation.
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     Barycentric calculus, a method of treating geometry by
        defining a point as the center of gravity of certain other
        points to which co["e]fficients or weights are ascribed.
     Calculus of functions, that branch of mathematics which
        treats of the forms of functions that shall satisfy given
     Calculus of operations, that branch of mathematical logic
        that treats of all operations that satisfy given
     Calculus of probabilities, the science that treats of the
        computation of the probabilities of events, or the
        application of numbers to chance.
     Calculus of variations, a branch of mathematics in which
        the laws of dependence which bind the variable quantities
        together are themselves subject to change.
     Differential calculus, a method of investigating
        mathematical questions by using the ratio of certain
        indefinitely small quantities called differentials. The
        problems are primarily of this form: to find how the
        change in some variable quantity alters at each instant
        the value of a quantity dependent upon it.
     Exponential calculus, that part of algebra which treats of
     Imaginary calculus, a method of investigating the relations
        of real or imaginary quantities by the use of the
        imaginary symbols and quantities of algebra.
     Integral calculus, a method which in the reverse of the
        differential, the primary object of which is to learn from
        the known ratio of the indefinitely small changes of two
        or more magnitudes, the relation of the magnitudes
        themselves, or, in other words, from having the
        differential of an algebraic expression to find the
        expression itself.
        [1913 Webster]

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