A lgebraic solution to a geometric problem
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A lgebraic solution to a  geometric problem. S quaring of a lune. Even in ancient times people have watched and studied the dependence of the moons and their daily lives.

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A lgebraic solution to a geometric problem

Algebraic solutionto a geometric problem

Squaring of a lune


A lgebraic solution to a geometric problem

Even in ancient times people have watched and studied the dependence of the moons and their daily lives


A lgebraic solution to a geometric problem

Figure enclosed by two arcs of circles are called Freckles (moons) because of their similarity with the visible phases of the moon, the moon of earth.


A lgebraic solution to a geometric problem

The squaring of a plane figure is the construction – using only straightedge and compass – of a square having area equal to that of the original plane figure.


A lgebraic solution to a geometric problem

SinceOC is a radius of the semicircle =>OC=r

By the Pythagorean theorem


A lgebraic solution to a geometric problem

Construct the midpoint D of AC.

Construct the

Semicircle

midpoint D of AC.


A lgebraic solution to a geometric problem

Our goal is to show that the purple lune AECF is squarable.

area of

AEC=

ACB=


So it terms of areas

So, it terms of areas

=1/2


A lgebraic solution to a geometric problem

In terms of the first octant of our shaded figure, this says that:

Small semicircle = 1/2 large semicircle.


A lgebraic solution to a geometric problem

=

=


A lgebraic solution to a geometric problem

In many archaeological excavations in the Bulgarian lands have found drawings of the moon in different 

Phases. 

Excavations in Baylovo


A lgebraic solution to a geometric problem

In 1840 T. Clausen (Danish mathematician) raises the question of finding all the freckles with a line and a compass, provided that the central angles of the ridges surrounding are equal. That means that there must be a real positive number Q and positive mutual goals primes m, n, such that the corners are met:

= m.Q 1= n Q


A lgebraic solution to a geometric problem

He establishes the same cases to examine and Hippocrates of Hios but expresses the hypothesis that freckles can be square in the following 5 cases:

m= 2n= 1

m= 3n= 1

m= 3n= 2

m= 5n= 1

m= 5n= 3


A lgebraic solution to a geometric problem

а = sin

, b = sin 1

C =

In 1902 E. Landau deals with the question of squaring a moon. He proves that the moon can be squared of the first kind Numbers


A lgebraic solution to a geometric problem

Sin(m

) =

Sin(n

1 )

If the number of c= 0 is squarable moon, and if the corners are not commensurate Moon squarable. It is believed that he used the addiction, which is familiar and

T. Clausen.


A lgebraic solution to a geometric problem

Landau considered n = 1, m = p = +

a gaussian number in which the moon is squarable. When k = 1, k = 2 are obtained Hioski cases of Hippocrates.


A lgebraic solution to a geometric problem

= 0

Х8 + Х 7 - 7Х6 + 15Х4 +10 Х3 – 10Х2 – 4Х + 1 -

In 1929 Chakalov Lyubomir (Bulgarian mathematician) was interested of tLandau’s work and used algebraic methods to solve geometric problems. Chakalov consider the case p = 17, making X = cos 2 and obtained equation of the eighth grade.


A lgebraic solution to a geometric problem

He proves that this equation is solvable by radicals square only when the numbers generated by the sum of its roots are roots of the equation by Grade 4.


A lgebraic solution to a geometric problem

Х = cos2

+ sin 2

Chakalov use and another equation

Then:

n Xn ( Xm - 1 )2 – m Xm ( Xn – 1 )2 = 0

X = 1 is the root of the equation

So he gets another equation:


A lgebraic solution to a geometric problem

Chakalov consider factoring of this simple polynomial multipliers for different values ​​of m and n. So he found a lot of cases where the freckles are not squrable. It extends the results of Landau for non Gaussian numbers.


A lgebraic solution to a geometric problem

In 1934 N.G. Chebotaryov (Russian mathematician) Consider a polynomial Chakalov and proves that if the numbers m, n are odd, freckles squrable is given only in cases of Hippocrates, and in other cases not squaring.


A lgebraic solution to a geometric problem

In 1947 a student of Chebotaryov,

A. C. Dorodnov had proven cases in which polynomial of Chakalov is broken into simple factors and summarizes the work of mathematicians who worked on the problem before him. So the case of clauses is proven.


A lgebraic solution to a geometric problem

Thus ended the millennial history of a geometrical problem, solved by algebraic methods by mathematicians’ researches from different nationalities.


Tomas klausen

Tomas Klausen


Hippocrates of chios about 470 bc about 410 bc

Hippocrates of Chiosabout 470 BC - about 410 BC


Tomas klausen1

Tomas Klausen


Edmund landau

Edmund Landau


A lgebraic solution to a geometric problem

Любомир Чакалов


A lgebraic solution to a geometric problem

Чеботарьов


A lgebraic solution to a geometric problem

Анатолий Дороднов


A lgebraic solution to a geometric problem

References: “Bulgarian mathematicians” Sofia, avt.Ivan Chobanov, P. Roussev


Made by

Made by:

Kalina Taneva

Ivelina Georgieva

Stella Todorova

Ioana Dineva

SOU “Zheleznik” Bulgaria


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