20 research outputs found
Orthogonal polynomials of compact simple Lie groups
Recursive algebraic construction of two infinite families of polynomials in
variables is proposed as a uniform method applicable to every semisimple
Lie group of rank . Its result recognizes Chebyshev polynomials of the first
and second kind as the special case of the simple group of type . The
obtained not Laurent-type polynomials are proved to be equivalent to the
partial cases of the Macdonald symmetric polynomials. Basic relation between
the polynomials and their properties follow from the corresponding properties
of the orbit functions, namely the orthogonality and discretization. Recurrence
relations are shown for the Lie groups of types , , , ,
, , and together with lowest polynomials.Comment: 34 pages, some minor changes were done, to appear in IJMM
ΠΠΈΠ·Π½Π°ΡΠ΅Π½Π½Ρ Π½Π°ΠΏΡΡΠΆΠ΅Π½Ρ Π² ΠΌΠ΅ΡΠ°Π»ΠΎΠΊΠΎΠ½ΡΡΡΡΠΊΡΡΡ ΠΌΠΎΡΡΠΎΠ²ΠΎΠ³ΠΎ ΠΊΡΠ°Π½Π° ΠΏΡΠΈ Π²ΠΈΠΊΠΎΡΠΈΡΡΠ°Π½Π½Ρ Ρ ΠΎΠ΄ΠΎΠ²ΠΈΡ ΠΊΠΎΠ»ΡΡ Π½ΠΎΠ²ΠΎΡ ΠΊΠΎΠ½ΡΡΡΡΠΊΡΡΡ
This paper proposes a method to experimentally study the stressed state of the metallic structure of an overhead crane when using running wheels of different designs. The study employed a functioning electric, supporting, double-girder overhead crane with a capacity of 5 tons and a run of 22.5 m. Strain gauges assembled in a semi-bridge circuit and connected to the analog-digital converter Zetlab210 (Russia) were used to determine the girder deformations at the time of hoisting and moving cargoes of different masses. The cargo was lifted and displaced under the same conditions, on the regular wheels of a cargo trolley and the wheels with an elastic rubber insert. The girder deformation diagrams were constructed. The subsequent recalculation produced the stressed state's dependences at each point of cargo movement when using both regular wheels and the wheels with an elastic rubber insert. Also established were the dependences and the duration of oscillations that occur over the cycle of cargo lifting and moving. The experimental study cycle included cargo lifting in the far-left position by a trolley, moving the cargo to the far-right position, and returning the trolley with the cargo to its original position.
It should be noted that the application of a new, modernized design of the running wheels of a cargo trolley with an elastic rubber insert effectively dampen the oscillations in the metallic structure of the crane.
The experimental study's results helped establish an 18 % reduction in stresses in the girder of the overhead crane, as well as a decrease in peak vibrations, by 20 seconds, at the same cycles of cargo hoisting and moving. In addition, using wheels with an elastic rubber insert reduces the period of oscillation damping at the end of the cycle of cargo movement, by at least 30 %.ΠΡΠ΅Π΄Π»ΠΎΠΆΠ΅Π½ ΠΌΠ΅ΡΠΎΠ΄ ΡΠΊΡΠΏΠ΅ΡΠΈΠΌΠ΅Π½ΡΠ°Π»ΡΠ½ΠΎΠ³ΠΎ ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΡ Π½Π°ΠΏΡΡΠΆΠ΅Π½Π½ΠΎΠ³ΠΎ ΡΠΎΡΡΠΎΡΠ½ΠΈΡ ΠΌΠ΅ΡΠ°Π»Π»ΠΎΠΊΠΎΠ½ΡΡΡΡΠΊΡΠΈΠΈ ΠΌΠΎΡΡΠΎΠ²ΠΎΠ³ΠΎ ΠΊΡΠ°Π½Π° ΠΏΡΠΈ ΠΈΡΠΏΠΎΠ»ΡΠ·ΠΎΠ²Π°Π½ΠΈΠΈ Ρ
ΠΎΠ΄ΠΎΠ²ΡΡ
ΠΊΠΎΠ»Π΅Ρ ΡΠ°Π·Π»ΠΈΡΠ½ΠΎΠΉ ΠΊΠΎΠ½ΡΡΡΡΠΊΡΠΈΠΈ. ΠΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΠ΅ ΠΏΡΠΎΠ²ΠΎΠ΄ΠΈΠ»ΠΎΡΡ Π½Π° Π΄Π΅ΠΉΡΡΠ²ΡΡΡΠ΅ΠΌ ΡΠ»Π΅ΠΊΡΡΠΈΡΠ΅ΡΠΊΠΎΠΌ, ΠΎΠΏΠΎΡΠ½ΠΎΠΌ, Π΄Π²ΡΡ
Π±Π°Π»ΠΎΡΠ½ΠΎΠ³ΠΎ ΠΌΠΎΡΡΠΎΠ²ΠΎΠΌ ΠΊΡΠ°Π½Π΅ Π³ΡΡΠ·ΠΎΠΏΠΎΠ΄ΡΠ΅ΠΌΠ½ΠΎΡΡΡΡ 5 Ρ, ΠΏΡΠΎΠ»Π΅ΡΠΎΠΌ 22,5 ΠΌ. Π‘ ΠΏΠΎΠΌΠΎΡΡΡ ΡΠ΅Π½Π·ΠΎΡΠ΅Π·ΠΈΡΡΠΎΡΠΎΠ², ΡΠΎΠ±ΡΠ°Π½Π½ΡΡ
Π² ΠΏΠΎΠ»ΡΠΌΠΎΡΡΠΎΠ²ΡΡ ΡΡ
Π΅ΠΌΡ ΠΈ ΠΏΠΎΠ΄ΠΊΠ»ΡΡΠ΅Π½Π½ΡΡ
ΠΊ Π°Π½Π°Π»ΠΎΠ³ΠΎ-ΡΠΈΡΡΠΎΠ²ΠΎΠΌΡ ΠΏΡΠ΅ΠΎΠ±ΡΠ°Π·ΠΎΠ²Π°ΡΠ΅Π»Ρ Zetlab 210 (Π ΠΎΡΡΠΈΡ), Π±ΡΠ»ΠΈ ΠΎΠΏΡΠ΅Π΄Π΅Π»Π΅Π½Ρ Π΄Π΅ΡΠΎΡΠΌΠ°ΡΠΈΠΈ Π³Π»Π°Π²Π½ΠΎΠΉ Π±Π°Π»ΠΊΠΈ Π² ΠΌΠΎΠΌΠ΅Π½Ρ ΠΏΠΎΠ΄ΡΠ΅ΠΌΠ° ΠΈ ΠΏΠ΅ΡΠ΅ΠΌΠ΅ΡΠ΅Π½ΠΈΠ΅ Π³ΡΡΠ·Π° ΡΠ°Π·Π»ΠΈΡΠ½ΠΎΠΉ ΠΌΠ°ΡΡΡ. ΠΠΎΠ΄ΡΠ΅ΠΌ ΠΈ ΠΏΠ΅ΡΠ΅ΠΌΠ΅ΡΠ΅Π½ΠΈΠ΅ Π³ΡΡΠ·Π°, Π±ΡΠ» ΠΏΡΠΎΠ²Π΅Π΄Π΅Π½ ΠΏΡΠΈ ΠΎΠ΄ΠΈΠ½Π°ΠΊΠΎΠ²ΡΡ
ΡΡΠ»ΠΎΠ²ΠΈΡΡ
. ΠΠ° ΡΡΠ°ΡΠ½ΡΡ
ΠΊΠΎΠ»Π΅ΡΠ°Ρ
Π³ΡΡΠ·ΠΎΠ²ΠΎΠΉ ΡΠ΅Π»Π΅ΠΆΠΊΠΈ ΠΈ Π½Π° ΠΊΠΎΠ»Π΅ΡΠ°Ρ
Ρ ΡΠ»Π°ΡΡΠΈΡΠ½ΠΎΠΉ ΡΠ΅Π·ΠΈΠ½ΠΎΠ²ΠΎΠΉ Π²ΡΡΠ°Π²ΠΊΠΎΠΉ. ΠΡΠ»ΠΈ ΠΏΠΎΠ»ΡΡΠ΅Π½Ρ Π³ΡΠ°ΡΠΈΠΊΠΈ Π΄Π΅ΡΠΎΡΠΌΠ°ΡΠΈΠΈ Π³Π»Π°Π²Π½ΠΎΠΉ Π±Π°Π»ΠΊΠΈ. Π Π΄Π°Π»ΡΠ½Π΅ΠΉΡΠ΅ΠΌ ΠΏΠ΅ΡΠ΅ΡΡΠ΅ΡΠ΅ ΠΏΠΎΠ»ΡΡΠ΅Π½Ρ Π·Π°Π²ΠΈΡΠΈΠΌΠΎΡΡΠΈ Π½Π°ΠΏΡΡΠΆΠ΅Π½Π½ΠΎΠ³ΠΎ ΡΠΎΡΡΠΎΡΠ½ΠΈΡ Π² ΠΊΠ°ΠΆΠ΄ΠΎΠΌ ΠΌΠΎΠΌΠ΅Π½ΡΠ΅ ΠΏΠ΅ΡΠ΅ΠΌΠ΅ΡΠ΅Π½ΠΈΡ Π³ΡΡΠ·Π° ΠΏΡΠΈ ΠΈΡΠΏΠΎΠ»ΡΠ·ΠΎΠ²Π°Π½ΠΈΠΈ ΠΊΠ°ΠΊ ΡΡΠ°ΡΠ½ΡΡ
ΠΊΠΎΠ»Π΅Ρ, ΡΠ°ΠΊ ΠΈ ΠΊΠΎΠ»Π΅Ρ Ρ ΡΠ»Π°ΡΡΠΈΡΠ½ΠΎΠΉ ΡΠ΅Π·ΠΈΠ½ΠΎΠ²ΠΎΠΉ Π²ΡΡΠ°Π²ΠΊΠΎΠΉ. Π’Π°ΠΊΠΆΠ΅ Π±ΡΠ»ΠΈ ΠΎΠ±Π½Π°ΡΡΠΆΠ΅Π½Ρ Π·Π°Π²ΠΈΡΠΈΠΌΠΎΡΡΠΈ ΠΈ ΠΏΡΠΎΠ΄ΠΎΠ»ΠΆΠΈΡΠ΅Π»ΡΠ½ΠΎΡΡΠΈ ΠΊΠΎΠ»Π΅Π±Π°Π½ΠΈΠΉ, ΠΊΠΎΡΠΎΡΡΠ΅ Π²ΠΎΠ·Π½ΠΈΠΊΠ°ΡΡ Π² ΡΠ΅ΡΠ΅Π½ΠΈΠ΅ ΡΠΈΠΊΠ»Π° ΠΏΠΎΠ΄ΡΠ΅ΠΌΠ° ΠΈ ΠΏΠ΅ΡΠ΅ΠΌΠ΅ΡΠ΅Π½ΠΈΡ Π³ΡΡΠ·Π°. Π¦ΠΈΠΊΠ» ΡΠΊΡΠΏΠ΅ΡΠΈΠΌΠ΅Π½ΡΠ°Π»ΡΠ½ΠΎΠ³ΠΎ ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΡ ΡΠΎΡΡΠΎΡΠ» ΠΈΠ· ΠΏΠΎΠ΄ΡΠ΅ΠΌΠ° Π³ΡΡΠ·Π° Π² ΠΊΡΠ°ΠΉΠ½Π΅ΠΌ Π»Π΅Π²ΠΎΠΌ ΠΏΠΎΠ»ΠΎΠΆΠ΅Π½ΠΈΠΈ Π³ΡΡΠ·ΠΎΠ²ΠΎΠΉ ΡΠ΅Π»Π΅ΠΆΠΊΠΎΠΉ, ΠΏΠ΅ΡΠ΅ΠΌΠ΅ΡΠ΅Π½ΠΈΠΈ Π³ΡΡΠ·Π° Π² ΠΊΡΠ°ΠΉΠ½Π΅Π΅ ΠΏΡΠ°Π²ΠΎΠ΅ ΠΏΠΎΠ»ΠΎΠΆΠ΅Π½ΠΈΠ΅ ΠΈ Π²ΠΎΠ·Π²ΡΠ°ΡΠ΅Π½ΠΈΠ΅ Π³ΡΡΠ·ΠΎΠ²ΠΎΠΉ ΡΠ΅Π»Π΅ΠΆΠΊΠΈ Ρ Π³ΡΡΠ·ΠΎΠΌ Π² ΠΈΡΡ
ΠΎΠ΄Π½ΠΎΠ΅ ΠΏΠΎΠ»ΠΎΠΆΠ΅Π½ΠΈΠ΅.
ΠΡΠΎΠ±ΠΎ ΡΠ»Π΅Π΄ΡΠ΅Ρ ΠΎΡΠΌΠ΅ΡΠΈΡΡ, ΡΡΠΎ ΠΏΡΠΈΠΌΠ΅Π½Π΅Π½ΠΈΠ΅ Π½ΠΎΠ²ΠΎΠΉ, ΠΌΠΎΠ΄Π΅ΡΠ½ΠΈΠ·ΠΈΡΠΎΠ²Π°Π½Π½ΠΎΠΉ ΠΊΠΎΠ½ΡΡΡΡΠΊΡΠΈΠΈ Ρ
ΠΎΠ΄ΠΎΠ²ΡΡ
ΠΊΠΎΠ»Π΅Ρ Π³ΡΡΠ·ΠΎΠ²ΠΎΠΉ ΡΠ΅Π»Π΅ΠΆΠΊΠΈ Ρ ΡΠ»Π°ΡΡΠΈΡΠ½ΠΎΠΉ ΡΠ΅Π·ΠΈΠ½ΠΎΠ²ΠΎΠΉ Π²ΡΡΠ°Π²ΠΊΠΎΠΉ ΡΡΡΠ΅ΠΊΡΠΈΠ²Π½ΠΎ Π³Π°ΡΡΡ ΠΊΠΎΠ»Π΅Π±Π°Π½ΠΈΡ Π² ΠΌΠ΅ΡΠ°Π»Π»ΠΎΠΊΠΎΠ½ΡΡΡΡΠΊΡΠΈΠΈ ΠΊΡΠ°Π½Π°.
ΠΠΎ ΠΈΡΠΎΠ³Π°ΠΌ ΡΠΊΡΠΏΠ΅ΡΠΈΠΌΠ΅Π½ΡΠ°Π»ΡΠ½ΡΡ
ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΠΉ Π±ΡΠ»ΠΎ Π²ΡΡΠ²Π»Π΅Π½ΠΎ ΡΠΌΠ΅Π½ΡΡΠ΅Π½ΠΈΠ΅ Π½Π°ΠΏΡΡΠΆΠ΅Π½ΠΈΠΉ Π² Π³Π»Π°Π²Π½ΠΎΠΉ Π±Π°Π»ΠΊΠ΅ ΠΌΠΎΡΡΠΎΠ²ΠΎΠ³ΠΎ ΠΊΡΠ°Π½Π° Π½Π° 18 % ΠΈ ΡΠΌΠ΅Π½ΡΡΠ΅Π½ΠΈΠ΅ ΠΏΠΈΠΊΠΎΠ²ΡΡ
Π²ΠΈΠ±ΡΠ°ΡΠΈΠΉ Π½Π° 20 ΡΠ΅ΠΊΡΠ½Π΄ ΠΏΡΠΈ ΠΎΠ΄ΠΈΠ½Π°ΠΊΠΎΠ²ΡΡ
ΡΠΈΠΊΠ»Π°Ρ
ΠΏΠΎΠ΄ΡΠ΅ΠΌΠ° ΠΈ ΠΏΠ΅ΡΠ΅ΠΌΠ΅ΡΠ΅Π½ΠΈΡ Π³ΡΡΠ·Π°. Π’Π°ΠΊΠΆΠ΅ ΠΏΡΠΈ ΠΈΡΠΏΠΎΠ»ΡΠ·ΠΎΠ²Π°Π½ΠΈΠΈ ΠΊΠΎΠ»Π΅Ρ Ρ ΡΠ»Π°ΡΡΠΈΡΠ½ΠΎΠΉ ΡΠ΅Π·ΠΈΠ½ΠΎΠ²ΠΎΠΉ Π²ΡΡΠ°Π²ΠΊΠΎΠΉ ΡΠΌΠ΅Π½ΡΡΠ°Π΅ΡΡΡ ΠΏΠ΅ΡΠΈΠΎΠ΄ Π·Π°ΡΡΡ
Π°Π½ΠΈΡ ΠΊΠΎΠ»Π΅Π±Π°Π½ΠΈΠΉ ΠΎΠΊΠΎΠ½ΡΠ°Π½ΠΈΡ ΡΠΈΠΊΠ»Π° ΠΏΠ΅ΡΠ΅ΠΌΠ΅ΡΠ΅Π½ΠΈΡ Π³ΡΡΠ·Π° ΠΏΠΎ ΠΌΠ΅Π½ΡΡΠ΅ΠΉ ΠΌΠ΅ΡΠ΅ Π½Π° 30 %.ΠΠ°ΠΏΡΠΎΠΏΠΎΠ½ΠΎΠ²Π°Π½ΠΎ ΠΌΠ΅ΡΠΎΠ΄ Π΅ΠΊΡΠΏΠ΅ΡΠΈΠΌΠ΅Π½ΡΠ°Π»ΡΠ½ΠΎΠ³ΠΎ Π΄ΠΎΡΠ»ΡΠ΄ΠΆΠ΅Π½Π½Ρ Π½Π°ΠΏΡΡΠΆΠ΅Π½ΠΎΠ³ΠΎ ΡΡΠ°Π½Ρ ΠΌΠ΅ΡΠ°Π»ΠΎΠΊΠΎΠ½ΡΡΡΡΠΊΡΡΡ ΠΌΠΎΡΡΠΎΠ²ΠΎΠ³ΠΎ ΠΊΡΠ°Π½Ρ ΠΏΡΠΈ Π²ΠΈΠΊΠΎΡΠΈΡΡΠ°Π½Π½Ρ Ρ
ΠΎΠ΄ΠΎΠ²ΠΈΡ
ΠΊΠΎΠ»ΡΡ ΡΡΠ·Π½ΠΎΡ ΠΊΠΎΠ½ΡΡΡΡΠΊΡΡΡ. ΠΠΎΡΠ»ΡΠ΄ΠΆΠ΅Π½Π½Ρ ΠΏΡΠΎΠ²ΠΎΠ΄ΠΈΠ»ΠΎΡΡ Π½Π° Π΄ΡΡΡΠΎΠΌΡ Π΅Π»Π΅ΠΊΡΡΠΈΡΠ½ΠΎΠΌΡ, ΠΎΠΏΠΎΡΠ½ΠΎΠΌΡ, Π΄Π²ΠΎΠ±Π°Π»ΠΊΠΎΠ²ΠΎΠΌΡ ΠΌΠΎΡΡΠΎΠ²ΠΎΠΌΡ ΠΊΡΠ°Π½Ρ Π²Π°Π½ΡΠ°ΠΆΠΎΠΏΡΠ΄ΠΉΠΎΠΌΠ½ΡΡΡΡ 5 Ρ, ΡΠ° ΠΏΡΠΎΠ³ΠΎΠ½ΠΎΠΌ 22,5 ΠΌ. ΠΠ° Π΄ΠΎΠΏΠΎΠΌΠΎΠ³ΠΎΡ ΡΠ΅Π½Π·ΠΎΡΠ΅Π·ΠΈΡΡΠΎΡΡΠ², Π·ΡΠ±ΡΠ°Π½ΠΈΡ
Π² Π½Π°ΠΏΡΠ²ΠΌΠΎΡΡΠΎΠ²Ρ ΡΡ
Π΅ΠΌΡ ΡΠ° ΠΏΡΠ΄ΠΊΠ»ΡΡΠ΅Π½ΠΈΡ
Π΄ΠΎ Π°Π½Π°Π»ΠΎΠ³ΠΎ-ΡΠΈΡΡΠΎΠ²ΠΎΠ³ΠΎ ΠΏΠ΅ΡΠ΅ΡΠ²ΠΎΡΡΠ²Π°ΡΠ° Zetlab 210 (Π ΠΎΡΡΡ), Π±ΡΠ»ΠΈ Π²ΠΈΠ·Π½Π°ΡΠ΅Π½Ρ Π΄Π΅ΡΠΎΡΠΌΠ°ΡΡΡ Π³ΠΎΠ»ΠΎΠ²Π½ΠΎΡ Π±Π°Π»ΠΊΠΈ Π² ΠΌΠΎΠΌΠ΅Π½Ρ ΠΏΡΠ΄ΠΉΠΎΠΌΡ ΡΠ° ΠΏΠ΅ΡΠ΅ΠΌΡΡΠ΅Π½Π½Ρ Π²Π°Π½ΡΠ°ΠΆΡ ΡΡΠ·Π½ΠΎΡ ΠΌΠ°ΡΠΈ. ΠΡΠ΄ΠΉΠΎΠΌ ΡΠ° ΠΏΠ΅ΡΠ΅ΠΌΡΡΠ΅Π½Π½Ρ Π²Π°Π½ΡΠ°ΠΆΡ, Π±ΡΠ»ΠΎ ΠΏΡΠΎΠ²Π΅Π΄Π΅Π½ΠΎ ΠΏΡΠΈ ΠΎΠ΄Π½Π°ΠΊΠΎΠ²ΠΈΡ
ΡΠΌΠΎΠ²Π°Ρ
Π½Π° ΡΡΠ°ΡΠ½ΠΈΡ
ΠΊΠΎΠ»Π΅ΡΠ°Ρ
Π²Π°Π½ΡΠ°ΠΆΠ½ΠΎΠ³ΠΎ Π²ΡΠ·ΠΊΠ° ΡΠ° Π½Π° ΠΊΠΎΠ»Π΅ΡΠ°Ρ
Π· Π΅Π»Π°ΡΡΠΈΡΠ½ΠΎΡ Π³ΡΠΌΠΎΠ²ΠΎΡ Π²ΡΡΠ°Π²ΠΊΠΎΡ. ΠΡΠ»ΠΈ ΠΎΡΡΠΈΠΌΠ°Π½Ρ Π³ΡΠ°ΡΡΠΊΠΈ Π΄Π΅ΡΠΎΡΠΌΠ°ΡΡΡ Π³ΠΎΠ»ΠΎΠ²Π½ΠΎΡ Π±Π°Π»ΠΊΠΈ. Π ΠΏΠΎΠ΄Π°Π»ΡΡΠΎΠΌΡ ΠΏΠ΅ΡΠ΅ΡΠ°Ρ
ΡΠ½ΠΊΡ ΠΎΡΡΠΈΠΌΠ°Π½Ρ Π·Π°Π»Π΅ΠΆΠ½ΠΎΡΡΡ Π½Π°ΠΏΡΡΠΆΠ΅Π½ΠΎΠ³ΠΎ ΡΡΠ°Π½Ρ Π² ΠΊΠΎΠΆΠ½ΠΎΠΌΡ ΠΌΠΎΠΌΠ΅Π½ΡΡ ΠΏΠ΅ΡΠ΅ΠΌΡΡΠ΅Π½Π½Ρ Π²Π°Π½ΡΠ°ΠΆΡ ΠΏΡΠΈ Π²ΠΈΠΊΠΎΡΠΈΡΡΠ°Π½Ρ ΡΠΊ ΡΡΠ°ΡΠ½ΠΈΡ
ΠΊΠΎΠ»ΡΡ ΡΠ°ΠΊ Ρ ΠΊΠΎΠ»ΡΡ Π· Π΅Π»Π°ΡΡΠΈΡΠ½ΠΎΡ Π³ΡΠΌΠΎΠ²ΠΎΡ Π²ΡΡΠ°Π²ΠΊΠΎΡ. Π’Π°ΠΊΠΎΠΆ Π±ΡΠ»ΠΈ Π²ΠΈΡΠ²Π»Π΅Π½Ρ Π·Π°Π»Π΅ΠΆΠ½ΠΎΡΡΡ ΡΠ° ΡΡΠΈΠ²Π°Π»ΠΎΡΡΡ ΠΊΠΎΠ»ΠΈΠ²Π°Π½Ρ, ΡΠΊΡ Π²ΠΈΠ½ΠΈΠΊΠ°ΡΡΡ Π² ΠΏΡΠΎΠ΄ΠΎΠ²ΠΆ ΡΠΈΠΊΠ»Ρ ΠΏΡΠ΄ΠΉΠΎΠΌΡ ΡΠ° ΠΏΠ΅ΡΠ΅ΠΌΡΡΠ΅Π½Π½Ρ Π²Π°Π½ΡΠ°ΠΆΡ. Π¦ΠΈΠΊΠ» Π΅ΠΊΡΠΏΠ΅ΡΠΈΠΌΠ΅Π½ΡΠ°Π»ΡΠ½ΠΎΠ³ΠΎ Π΄ΠΎΡΠ»ΡΠ΄ΠΆΠ΅Π½Π½Ρ ΡΠΊΠ»Π°Π΄Π°Π²ΡΡ Π· ΠΏΡΠ΄ΠΉΠΎΠΌΡ Π²Π°Π½ΡΠ°ΠΆΡ Π² ΠΊΡΠ°ΠΉΠ½ΡΠΎΠΌΡ Π»ΡΠ²ΠΎΠΌΡ ΠΏΠΎΠ»ΠΎΠΆΠ΅Π½Π½Ρ Π²Π°Π½ΡΠ°ΠΆΠ½ΠΈΠΌ Π²ΡΠ·ΠΊΠΎΠΌ, ΠΏΠ΅ΡΠ΅ΠΌΡΡΠ΅Π½Π½Ρ Π²Π°Π½ΡΠ°ΠΆΡ Π² ΠΊΡΠ°ΠΉΠ½Ρ ΠΏΡΠ°Π²Π΅ ΠΏΠΎΠ»ΠΎΠΆΠ΅Π½Π½Ρ ΡΠ° ΠΏΠΎΠ²Π΅ΡΠ½Π΅Π½Π½Ρ Π²Π°Π½ΡΠ°ΠΆΠ½ΠΎΠ³ΠΎ Π²ΡΠ·ΠΊΠ° Π· Π²Π°Π½ΡΠ°ΠΆΠ΅ΠΌ Π² ΠΏΠΎΡΠ°ΡΠΊΠΎΠ²Π΅ ΠΏΠΎΠ»ΠΎΠΆΠ΅Π½Π½Ρ.
ΠΡΠΎΠ±Π»ΠΈΠ²ΠΎ ΡΠ»ΡΠ΄ Π²ΡΠ΄Π·Π½Π°ΡΠΈΡΠΈ, ΡΠΎ Π·Π°ΡΡΠΎΡΡΠ²Π°Π½Π½Ρ Π½ΠΎΠ²ΠΎΡ, ΠΌΠΎΠ΄Π΅ΡΠ½ΡΠ·ΠΎΠ²Π°Π½ΠΎΡ ΠΊΠΎΠ½ΡΡΡΡΠΊΡΡΡ Ρ
ΠΎΠ΄ΠΎΠ²ΠΈΡ
ΠΊΠΎΠ»ΡΡ Π²Π°Π½ΡΠ°ΠΆΠ½ΠΎΠ³ΠΎ Π²ΡΠ·ΠΊΠ° Π· Π΅Π»Π°ΡΡΠΈΡΠ½ΠΎΡ Π³ΡΠΌΠΎΠ²ΠΎΡ Π²ΡΡΠ°Π²ΠΊΠΎΡ Π΅ΡΠ΅ΠΊΡΠΈΠ²Π½ΠΎ Π³Π°ΡΡΡΡ ΠΊΠΎΠ»ΠΈΠ²Π°Π½Π½Ρ Π² ΠΌΠ΅ΡΠ°Π»ΠΎΠΊΠΎΠ½ΡΡΡΡΠΊΡΡΡ ΠΊΡΠ°Π½Π°.
ΠΠ° ΠΏΡΠ΄ΡΡΠΌΠΊΠ°ΠΌΠΈ Π΅ΠΊΡΠΏΠ΅ΡΠΈΠΌΠ΅Π½ΡΠ°Π»ΡΠ½ΠΈΡ
Π΄ΠΎΡΠ»ΡΠ΄ΠΆΠ΅Π½Ρ Π±ΡΠ»ΠΎ Π²ΠΈΡΠ²Π»Π΅Π½ΠΎ Π·ΠΌΠ΅Π½ΡΠ΅Π½Π½Ρ Π½Π°ΠΏΡΡΠΆΠ΅Π½Ρ Π² Π³ΠΎΠ»ΠΎΠ²Π½ΡΠΉ Π±Π°Π»ΡΡ ΠΌΠΎΡΡΠΎΠ²ΠΎΠ³ΠΎ ΠΊΡΠ°Π½Ρ Π½Π° 18 % ΡΠ° Π·ΠΌΠ΅Π½ΡΠ΅Π½Π½Ρ ΠΏΡΠΊΠΎΠ²ΠΈΡ
Π²ΡΠ±ΡΠ°ΡΡΠΉ Π½Π° 20 ΡΠ΅ΠΊΡΠ½Π΄ ΠΏΡΠΈ ΠΎΠ΄Π½Π°ΠΊΠΎΠ²ΠΈΡ
ΡΠΈΠΊΠ»Π°Ρ
ΠΏΡΠ΄ΠΉΠΎΠΌΡ ΡΠ° ΠΏΠ΅ΡΠ΅ΠΌΡΡΠ΅Π½Π½Ρ Π²Π°Π½ΡΠ°ΠΆΡ. Π’Π°ΠΊΠΎΠΆ ΠΏΡΠΈ Π²ΠΈΠΊΠΎΡΠΈΡΡΠ°Π½Π½Ρ ΠΊΠΎΠ»ΡΡ Π· Π΅Π»Π°ΡΡΠΈΡΠ½ΠΎΡ Π³ΡΠΌΠΎΠ²ΠΎΡ Π²ΡΡΠ°Π²ΠΊΠΎΡ Π·ΠΌΠ΅Π½ΡΡΡΡΡΡΡ ΠΏΠ΅ΡΡΠΎΠ΄ Π·Π³Π°ΡΠ°Π½Π½Ρ ΠΊΠΎΠ»ΠΈΠ²Π°Π½Ρ Π·Π°ΠΊΡΠ½ΡΠ΅Π½Π½Ρ ΡΠΈΠΊΠ»Ρ ΠΏΠ΅ΡΠ΅ΠΌΡΡΠ΅Π½Π½Ρ Π²Π°Π½ΡΠ°ΠΆΡ ΡΠΎΠ½Π°ΠΉΠΌΠ΅Π½ΡΠ΅ Π½Π° 30 %
Contractions of Low-Dimensional Lie Algebras
Theoretical background of continuous contractions of finite-dimensional Lie
algebras is rigorously formulated and developed. In particular, known necessary
criteria of contractions are collected and new criteria are proposed. A number
of requisite invariant and semi-invariant quantities are calculated for wide
classes of Lie algebras including all low-dimensional Lie algebras.
An algorithm that allows one to handle one-parametric contractions is
presented and applied to low-dimensional Lie algebras. As a result, all
one-parametric continuous contractions for the both complex and real Lie
algebras of dimensions not greater than four are constructed with intensive
usage of necessary criteria of contractions and with studying correspondence
between real and complex cases.
Levels and co-levels of low-dimensional Lie algebras are discussed in detail.
Properties of multi-parametric and repeated contractions are also investigated.Comment: 47 pages, 4 figures, revised versio
Realizations of Real Low-Dimensional Lie Algebras
Using a new powerful technique based on the notion of megaideal, we construct
a complete set of inequivalent realizations of real Lie algebras of dimension
no greater than four in vector fields on a space of an arbitrary (finite)
number of variables. Our classification amends and essentially generalizes
earlier works on the subject.
Known results on classification of low-dimensional real Lie algebras, their
automorphisms, differentiations, ideals, subalgebras and realizations are
reviewed.Comment: LaTeX2e, 39 pages. Essentially exetended version. Misprints in
Appendix are correcte
Three dimensional C-, S- and E-transforms
Three dimensional continuous and discrete Fourier-like transforms, based on
the three simple and four semisimple compact Lie groups of rank 3, are
presented. For each simple Lie group, there are three families of special
functions (-, -, and -functions) on which the transforms are built.
Pertinent properties of the functions are described in detail, such as their
orthogonality within each family, when integrated over a finite region of
the 3-dimensional Euclidean space (continuous orthogonality), as well as when
summed up over a lattice grid (discrete orthogonality). The
positive integer sets up the density of the lattice containing . The
expansion of functions given either on or on is the paper's main
focus.Comment: 24 pages, 13 figure