The exsecant and excosecant functions can be extended into the complex plane. Images, videos and audio are available under their respective licenses. Home FAQ Contact. Exsecant Wikipedia open wikipedia design. Hackley, Charles W. Adapted to and for the use of all classes of practical mechanics. Tables of radii and their logarithms, natural and logarithmic versed sines and external secants, natural sines and tangents to every degree and minute of the quadrant, and logarithms from the natural numbers from 1 to 10, Gregory, successor of W.

Retrieved Haslett, one of the Engineers of that Road, are now for the first time given to the public. Experience has shown, that versed sines and external secants as frequently enter into calculations on curves as sines and tangents; and by their use, as illustrated in the examples given in this work, it is believed that many of the rules in general use are much simplified, and many calculations concerning curves and running lines made less intricate, and results obtained with more accuracy and far less trouble, than by any methods laid down in works of this kind.

The examples given have all been suggested by actual practice, and will explain themselves.

## Pocketbook of Mathematical Functions - Abramowitz and Stegun abbreviated

Railroad Curves and Earthwork. Spon, Ltd. Field Manual for Railroad Engineers 1 ed.

The Engineer Review : Archived PDF from the original on Part I: Plane Trigonometry. Cushing Co. In Clagett, Marshall ed.

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Critical Problems in the History of Science 3 ed. Applied Mathematics Series. The number of partitions of n is given by the partition function p n.

Partitions can be graph. Title page of John Napier's Logarithmorum from The history of logarithms is the story of a correspondence in modern terms, a group isomorphism between multiplication on the positive real numbers and addition on the real number line that was formalized in seventeenth century Europe and was widely used to simplify calculation until the advent of the digital computer. The Napierian logarithms were published first in Henry Briggs introduced common base 10 logarithms, which were easier to use. Tables of logarithms were published in many forms over four centuries.

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The idea of logarithms was also used to construct the slide rule, which became ubiquitous in science and engineering until the s. A breakthrough generating the natural logarithm was the result of a search for an expression of area against a rectangular hyperbola, and required the assimilation of a new function into standard mathematics.

Common logarithm Canon logarithmorum As the common log of ten is one, of a hundred is two, and. Basis of trigonometry: if two right triangles have equal acute angles, they are similar, so their side lengths are proportional. In mathematics, the trigonometric functions also called circular functions, angle functions or goniometric functions[1][2] are real functions which relate an angle of a right-angled triangle to ratios of two side lengths. They are widely used in all sciences that are related to geometry, such as navigation, solid mechanics, celestial mechanics, geodesy, and many others.

## NoZDR - Справочники, методички и учебники по математике

They are among the simplest periodic functions, and as such are also widely used for studying periodic phenomena, through Fourier analysis. The most widely used trigonometric functions are the sine, the cosine, and the tangent. Their reciprocals are respectively the cosecant, the secant, and the cotangent, which are less used in modern mathematics.

The oldest definitions of trigonometr. This distribution arises as the limiting distribution of eigenvalues of many random symmetric matrices as the size of the matrix approaches infinity. In probability theory and directional statistics, the von Mises distribution also known as the circular normal distribution or Tikhonov distribution is a continuous probability distribution on the circle.

It is a close approximation to the wrapped normal distribution, which is the circular analogue of the normal distribution. On the other hand, the von Mises distribution is the stationary distribution of a drift and diffusion process on the circle in a harmonic potential, i. The von Mises distribution is a special case of the von Mises—Fisher distribution on the N-dimensional sphere.

- Logarithms : definition of Logarithms and synonyms of Logarithms (English).
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Definition The von Mises probability density function for t. In mathematics, hyperbolic functions are analogs of the ordinary trigonometric, or circular, functions. The basic hyperbolic functions are: hyperbolic sine "sinh" ,[1] hyperbolic cosine "cosh" ,[2] from which are derived: hyperbolic tangent "tanh" ,[3] hyperbolic cosecant "csch" or "cosech" [2] or hyperbolic secant "sech" ,[4] hyperbolic cotangent "coth" ,[5][6] corresponding to the derived trigonometric functions.

For points on the hyperbola below the x-axis, the area is considered negative see animated version with comparison with the trigonometric circular functions. Just as the points cos t, sin t form a circle with a unit radius, the points cosh t, sinh t form the right. Coordinate surfaces of parabolic cylindrical coordinates. The above equation may be brought into two distinct forms A and B by completing the square and rescaling z, called H.

Plots of S x and C x. The maximum of C x is about 0. The Fresnel integrals S x and C x are two transcendental functions named after Augustin-Jean Fresnel that are used in optics and are closely related to the error function erf. Recently, they have been used in the design of highways and other engineering projects.

The Fresnel. Plot of the error function In mathematics, the error function also called the Gauss error function is a special function non-elementary of sigmoid shape that occurs in probability, statistics, and partial differential equations describing diffusion. There are several closely related functions, such as the complementary error function, the imaginary error function, and others. Name The name "error function" and it.

Babylonian clay tablet YBC c. The approximation of the square root of 2 is four sexagesimal figures, which is about six decimal figures. The growth in computing power has revolutionized the use of realistic mathematical models in science and engineering, and subtle numerical analysis is required to implement these detailed models of the world.

For example, ordinary differential equations appear in celestial mechanics predicting the motions of planets, stars and galaxies.

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In mathematics, the logarithmic integral function or integral logarithm li x is a special function. It is relevant in problems of physics and has number theoretic significance. In probability theory, the normal or Gaussian or Gauss or Laplace—Gauss distribution is a very common continuous probability distribution. Normal distributions are important in statistics and are often used in the natural and social sciences to represent real-valued random variables whose distributions are not known.

The normal distribution is useful because of the central limit theorem. In its most general form, under some conditions which include finite variance , it states that averages of samples of observations of random variables independently drawn from independent distributions converge in distribution to the normal, that is, they become normally distributed when the number of observations is sufficiently large. Physical quantities that are expected to be the sum of many independent processes such as measurement errors often have distributions that are nearly normal.

Comparison of Stirling's approximation with the factorial In mathematics, Stirling's approximation or Stirling's formula is an approximation for factorials. It is a good approximation, leading to accurate results even for small values of n. It is named after James Stirling, though it was first stated by Abraham de Moivre. The gamma function is defined for all complex numbers except the non-positive integers.

The gamma fu. There are common integrals in quantum field theory that appear repeatedly. Other integrals can be approximated by versions of the gaussian integral. Fourier integrals are also considered. Variations on a simple gaussian integral Gaussian integral The first integral, with broad application outside of quantum field theory, is the gaussian integral. In mathematics, a confluent hypergeometric function is a solution of a confluent hypergeometric equation, which is a degenerate form of a hypergeometric differential equation where two of the three regular singularities merge into an irregular singularity.

The term confluent refers to the merging of singular points of families of differential equations; confluere is Latin for "to flow together".

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This is also known as the confluent hypergeometric function of the first kind. There is a different and unrelated Kummer's function bearing the same name. This is also known as the confluent hypergeometric function of the second kin. A graph of the common logarithm of numbers from 0. In mathematics, the common logarithm is the logarithm with base Historically, it was known as logarithmus decimalis[2] or logarithmus decadis. To mitigate this ambiguity, the ISO specification recommends that log x should be written lg x and log x should be ln x.

Page from a table of common logarithms. This page shows the logarithms for numbers from to to fi.