II INTERNATIONAL SCIENTIFIC CONFERENCE OF YOUNG RESEARCHERS
Baku Engineering University
18
27-28 April 2018, Baku, Azerbaijan
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5600 MB Eindhoven, The Netherlands, Journal of Engineering Mathematics 47: 175–183, 2003. ©2003 Kluwer
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erry J. Batzel and Franz Kappel, MATHEMATICAL PHYSIOLOGY ,2002, USA.
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enc.ru/m/15/funktsionalnye-metody-issledovania-pochek-3.shtml.
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calculations *",Russia.
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the journal "Avtomat and Telemach" in 2006
EXISTENCE AND UNIQUENESS RESULTS OF FOR FIRST-ORDER
DIFFERENTIAL EQUATIONS WITH FOUR-POINT BOUNDARY CONDITIONS
Yagub SHARIFOV
Baku State University
sharifov22@rambler.ru
AZERBAIJAN
Kemale ISMAYILOVA
Baku Engineering University
keismayilova@beu.edu.az
AZERBAIJAN
In this thesis, we investigate the existence and uniqueness of solutions to boundary value
problems for ordinary differential equations with four-point boundary conditions. Obtained existence
and uniqueness results are showed with well-known fixed point theorems.
We study existence and uniqueness of solutions of nonlinear differential equations of the type
??????̇ = ??????(??????, ??????), ?????? ∈ [0, ??????] (1)
with four-point boundary conditions
????????????(0) + ????????????(??????
1
) + ????????????(??????
2
) + ????????????(??????) = ?????? (2)
where
??????, ??????, ??????, ?????? are given constant matrixes, ?????? ∈ ??????
??????
, and
0 < ??????
1
< ??????
2
< ?????? fixed points.
Theorem 1: Assume that,
?????? ∈ ??????[0, ??????] × ??????
??????
, ??????
??????
), det ?????? ≠ 0,
?????? = ?????? + ?????? + ?????? + ??????.
The necessary and sufficient condition for it to be solution of problem
(1),(2) of function
??????(??????) is that the function ??????(??????) is to be solution of following integral equation:
??????(??????) = ??????
−1
?????? + ∫ ??????(??????, ??????)??????(??????, ??????(??????))????????????
??????
0
,
where
??????(??????, ??????) is Green function of problem (1), (2) and defined as following:
??????(??????, ??????) = {
??????
1
(??????, ??????) ?????????????????? ?????? ∈ [0, ??????
1
],
??????
2
(??????, ??????) ?????????????????? ?????? ∈ (??????
1
, ??????
2
),
??????
3
(??????, ??????) ?????????????????? ?????? ∈ [??????
2
, ??????].
such that
??????
1
(??????, ??????) =
{
??????
−1
??????, 0 ≤ ?????? ≤ ??????,
−??????
−1
(?????? + ?????? + ??????), ?????? < ?????? ≤ ??????
1
,
−??????
−1
(?????? + ??????), ??????
1
< ?????? ≤ ??????
2
,
−??????
−1
??????, ??????
2
< ?????? ≤ ??????,
??????
2
(??????, ??????) =
{
??????
−1
??????, 0 ≤ ?????? ≤ ??????
1
,
??????
−1
(?????? + ??????), ??????
1
< ?????? ≤ ??????,
−??????
−1
(?????? + ??????), ?????? < ?????? ≤ ??????
2
,
−??????
−1
??????, ??????
2
< ?????? ≤ ??????,
??????
3
(??????, ??????) =
{
??????
−1
??????, 0 ≤ ?????? ≤ ??????
1
,
??????
−1
(?????? + ??????), ??????
1
< ?????? ≤ ??????
2
,
??????
−1
(?????? + ?????? + ??????), ??????
2
< ?????? ≤ ??????,
−??????
−1
??????, ?????? < ?????? ≤ ??????.
I INTERNATIONAL SCIENTIFIC CONFERENCE OF YOUNG RESEARCHERS
Baku Engineering University
19
27-28 April 2018, Baku, Azerbaijan
Theorem 2: Assume
|??????(??????, ??????) − ??????(??????, ??????)| ≤ ??????|?????? − ??????|,
for each
?????? ∈ [0, ??????] and all ??????, ?????? ∈ ??????.
Besides
?????? = ?????????????????? < 1.
Then the boundary value problems (1), (2) have a unique solution on [0,T], where
?????? =
max
[0,??????]×[0,??????]
|??????(??????, ??????)|.
Note that the existence of the solution can be proved by applying the other fixed point theorems.
SFERİK FUNKSİYLARIN TƏTBİQİ İLƏ SFERA ÜÇÜN
XARİCİ SƏRHƏD MƏSƏLƏSİNİN HƏLLİ
Gülşən SƏMƏDZADƏ
Bakı Mühəndislik Universiteti
gsemedzade@std.qu.edu.az
AZƏRBAYCAN
Feyruz HƏSƏNOV
Bakı Mühəndislik Universiteti
fhesenov@qu.edu.az
AZƏRBAYCAN
Sferik funksiyalar
Sferik funksiyalar fiziki hadisələrin, sferik səthlərlə məhdudlaşmış fəzalar və sferik simmetriyaya
malik fiziki məsələlərin həlli üçün istifadə olunur. Bu funksiyalar diferensial tənliklər nəzəriyyəsində
və nəzəri fizikada böyük əhəmiyyətə malikdir.
Xülasə və açar sözlər: sərhəd məsələsi, Hankel funksiyaları, sərhəd şərti, həll
??????
0
radiuslu sfera üçün xarici sərhəd məsələsiə baxaq:
∆?????? + ??????
2
?????? = 0 (??????
2
> 0)
??????|
??????=??????
0
= ??????(??????, ??????)
lim
??????→∞
?????? (
????????????
????????????
+ ??????????????????) = 0,
?????? → ∞ olduqda ?????? = ?????? (
1
??????
).
Axtarılan ??????(??????, ??????, ??????) və??????(??????, ??????) funksiyalarını sferik funksiyalar üzrə sıraya ayıraq:
??????(??????, ??????, ??????) = ∑ ∑ ??????
??????
(??????)??????
??????
(??????)
(??????, ??????),
??????
??????=−??????
∞
??????=0
??????(??????, ??????) = ∑ ∑ ??????
????????????
??????
??????
(??????)
(??????, ??????)
??????
??????=−??????
.
∞
??????=0
Ayrılışın ??????
??????
(??????) əmsalı
??????
??????
´´
+
1
??????
??????
??????
´
+ (??????
2
−
??????(?????? + 1)
??????
2
) ??????
??????
= 0
tənliyini,
??????
??????
(??????
0
) = ??????
??????
sərhəd şərtini və ?????? → ∞ olduqda ??????
??????
(??????) = ?????? (
1
??????
),
lim
??????→∞
??????(??????
??????
´
+ ??????????????????
??????
) = 0
şərtlərini ödəyir. ??????
??????
(??????)-ə nəzərən tənliyin ümümi həlli
??????
??????
(??????) = ??????
??????
??????
??????
1
(????????????) + ??????
??????
??????
??????
2
(????????????)
şəklindədir.
Burada
??????
??????
1
(??????) = √
??????
2??????
??????
??????+
1
2
(1)
(??????)
??????
??????
2
(??????) = √
??????
2??????
??????
??????+
1
2
(2)
(??????).