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The Fourier, Laplace Transformations and the Newton Potential

Andrey Pavlov V.

Higher Mathematics, Moscow Inst. of Rad., Electr. And Automat. (MIREA), pr. Vernadskogo, Moscow, Russia

Abstract: With help of a methods of Fourier`s analysis we consider the analytic continuation of Laplace transformation (with help a values on the complex axis) to the left part of plane, when the continuation is odd ore even.

Keywords: format, microsoft laplace transform, fourier transform, even laplace transform, regularity of the laplace transform

Received October 15, 2014; Revised November 24, 2014; Accepted December 07, 2014

Citation: Andrey Pavlov V., The Fourier, Laplace Transformations and the Newton Potential. American Journal of Applied Mathematics and Statistics, 2 (6). 398-401. January 2014. doi:10.12691/ajams-2-6-7

1. Introduction

A communication between potentials of Newton and evenness of functions of type of Laplace transformations from Fourier transformations (the theorems 1, 3) is of principle for the article. The main result of the article are the theorems 1 and 2.

The second purpose of the article is a clarification of results of the works [1,2] (the remarks 1, 2, 3 and the theorem 3).

The results look like were formulated in works of author ([1,2,3,4]). In the works of author [1,2] the specifying investigation (the remark 2) was absent, and in the works ([3,4]) other methods were used.

We will mark, that unforeseeable results of theorem 2 and the theorems 3 are proved by different methods fully. A primary purpose of the article is a proof of these theorems.

A discussion of an consequences in the direction of possible compound of axiomatic notions of theory of functions of complex variable and the classic mathematical analysis is beyond the article.

2. The Laplace Transformation on the Complex Axis

Theorem 1.

The equalities

1.

2. for all

take place, if , if is continuous on , and

Proof.

We use (it is well-known)

where from remark 1

(After replacement of variable and after the substitution in place of value we obtain the second part of the equality 1 in the theorem 1).

The complex and the real parts of the first equality are the second equalities of the theorem 1.

Remark 1.

In the conditions of the theorem 1 the equalities

take place.

Proof.

From the inversion formula of the Fourier transformation we get

We obtain

From the condition we obtain all the conditions of the proposition 1 (taking into account the formula of integration on parts).

Proposition 1.

if is continuous for all By definition, .

(The proposition 1 takes place, if for all ; the functions are considered in the theorem 1).

Proof.

For from inequality

we can change the limits of integration in the initial expression ([5]).

The proposition 1 is proved.

After change of order of integration ([5]) from the proposition 1 we get the last part of the remark 1 :

and .

We will prove the main theorem 2.

Theorem 2.

In the conditions of the theorem 1

Proof.

From the theorem 1 we have

for

The main theorem 2 is proved.

Now, we will prove the remark 2. The remark is absent in works of author ([1,2]).

Remark 2.

In conditions of the remark 1

Proof.

After the change of limits of integration ([5]) , we obtain

Obviously, for the function there is a limit

where for the last equality we use the first part of the remark 3. We obtain , and too ([6]), (the regularity of the function in an open area of imaginary axis ensues from the obvious regularity of in all complex plane).

We get. from . For the odd the function the remark 2 is proved.

For the function we repeat the same reasoning of the remark 3 but for the sum.

Consequence.

From the remark 2 as analytical continuation of the function (not as in the theorem 1, see the theorem 2 too) we get

Theorem 3

In the conditions of remark 1 to the lemma 1 we get, that the analytic continuation of function from the right part of plane to left is equal to the analytic expression .

Proof.

From the remark 2 we get not only for , but for all . The existence of the is obvious (in the form ). We can use ([6])

and as in ([1,2]) from the theorem about the analytic continuation of the functions continuous on border we obtain, that is the same analytic function as for so as .

Remark 3. ([1,2]).

The analytic expression is even or odd expression, if the function is odd or even accordingly. It is obviously, if . From the theorem 3 we obtain, that the analytic function is even or odd in the all complex plain too.

Remark 4.

We will notice, that from the investigation of evenness of in the area of imaginary axis, we obtain

which it follows from taking into account the remark 2 and the theorem 3, but from point of the convergence of to , the , and from point of analytic continuations (physically from point of smooth transition-flow through the imaginary axis) the such actual values are absent.

The first given fact was marked by other methods in a few more general situation, but for other functions, in the works of author ([3,4]).

3. Conclusion

The first unforeseeable result is the theorem 2 (see so the formula (5) on the 209 page in the work [6]).

The second unforeseeable result we obtain from the remark 2 and the theorem 3: from point of the convergence of to , the (the value in the theorem 1), but from point of analytic continuations (physically from point of smooth transition-flow through the complex axis) the such values are absent (the fact was considered by other methods in the similar situation in the works of author ([6,7])); we get a similar situation from the given reasoning: if we get where as in remark 3

and

we obtain

But ([7])

and the only function is odd and even simultaneously, we get

References

[1]   | Andrey Pavlov V. A new inversion formula for Laplace transforms and the notion of evenness. Hor Reser. Publ., Univer. Journ. of Appl. Mathem. USA, 2014, 2, no. 3, pp. 148-152. (http://www.hrpub.org)
[2]   | Andrey Pavlov V. The new inversion of Laplace transforms. David Pub. Journ. of Mathem. and Syst. Scien., USA, 2014, no 4, pp. 197-201.(http://www.davidpublishing.org)
[3]   | Pavlov A.V. Disciplines with priority to the short requirements and the identical service. Ed.of FGBOU MGTU MIREA (MIREA), numb. of gov. reg. 0321401014 from apr. 17, 2014 (http://inforeg.ru), Moscow, 2014, ISBN 978-5-7339-1261-5, 119 p.
[4]   | Pavlov A.V. Reliable prognostication of the functions in the form of Laplace or Fourier transformations. Bulletin MGTU MIREA (77-57811 no. 180414), Moscow, 2014, 3, no. 2 (June), 78-85 pp. (http://www.mirea.ru)
[5]   | G.M.Fihtengoltz. The course of differential and integral calculus. (In Russian). Nauka. Moscow, 1969, v. II, -800 pp.
[6]   | Lavrentev M.A., Shabat B.V. Methods of the theory of function of complex variable. Nauka. Moscow, 1987, 544 p.
[7]   | Kolmogorov A.N., Fomin C.V. The elements of the functions theory and the functional analysis. Nauka. Moscow, 1 976, 44 p.