A Journal for Western Man

 

 

 

On the Periodicity of Pythagorean Triples

and Their Association with Radial Numbers

of Inscribed Circles

G. Stolyarov II

Issue X- February 6, 2003

 

 
It was while I contemplated the mathematical order of our universe and the supremacy of human reason in grasping it that my thoughts floated toward a formula I had recently read of on deriving the radii of circles inscribed into right triangles, a relationship of significant utility in architecture and engineering, as well as simple theoretical computations. I employed the formula to obtain the radii of the 3,4,5 triangle, which happened to be 1, then, the 5,12,13 triangle, which happened to be 2. “Is there a pattern?” I wondered, and delved into any potential numerical relationships between the numbers of a fundamental Pythagorean triple (that which cannot be further reduced and remain consisting of whole number values) and the radii of circles inscribed into triangles having sides corresponding to these triples. What I discovered sparked sheer astonishment and exhilaration within me.

Consider the following fundamental Pythagorean triples:

a= shorter leg  b= longer leg  c= hypotenuse  Inscribed circle radius
3                       4                      5                       1
5                     12                     13                      2
7                     24                     25                      3
9                     40                     41                      4

The radius of a circle inscribed into a right triangle is well known to be defined by the formula (a+b-c)/2. The length of the shorter leg seems to increase with every subsequent fundamental triple by two, with 3 as the first term. Hence, length of the shorter leg may be defined by the arithmetic series t(R)= 3+ 2(R-1)= 2R+1. R in this case is the number of the given term. However, this number also corresponds to the inscribed circle radius.
Thus, the shortest leg of a fundamental Pythagorean triangle equals twice the radius of the inscribed circle plus one.

Moreover, a pattern can be detected in the progression of B. The difference between b length of the second and first triples is 8. The difference between the third and second is 12. The difference between the fourth and third is sixteen. For every subsequent triple, the increase in difference between it and the last is four or 1*4. Therefore, any length of b in a fundamental Pythagorean triple can be defined as 4*(1+2+….+R), with R being the number of the fundamental triple. This can be expressed in series notation as 4k=1R
Σk or four times the sum of all consecutive natural numbers up to R.

In all fundamental Pythagorean triples of this sort, it is easily observable that the length of the hypotenuse, c, equals b+1. Henceforth, c equals one plus four times the sum of all consecutive natural numbers up to the radius of the inscribed circle, or 1+4k=1R
Σk. Now, we can also establish a correlation between this fact and the fact that a=2R+1. Since (a+b-(b+1))/2= R, 2R= a-1, a=2R+1.

Moreover, every fundamental Pythagorean triple is associated with a particular R value, which must be a natural whole number for the following reason: a=2R+1 and is a natural whole number, also an odd number for all fundamental Pythagorean triples. 2R= a-1, which, consequently, must be an even number, divisible by two. Hence, R must be a natural whole number.

From the preceding algorithms, it is possible to derive any fundamental Pythagorean triple knowing but the radius of its inscribed circle, or the length of a single side. Every fundamental Pythagorean triple shall henceforth be associated with a number, dubbed the radial number, equaling the length of the radius of its inscribed circle. Fundamental Pythagorean triples exist exclusively in association with such numbers, of the arithmetic sequence n, and their occurrence is therefore entirely periodic. Moreover, every positive integer radial number has a Pythagorean triple associated with it.

Hence, Stolyarov's Theorem:

Every possible integer radial number can be associated with a fundamental Pythagorean triple consisting of the lengths of the sides of the right triangle into which a circle with a radius of the radial number is inscribed. The relationship between the radial number R and the three numbers of the triple is as follows:

a= 2R+1
b= 4n=4k=1R
Σk
c= 1+
4k=1RΣk

Beauty is mathematical. I have written on that subject and proved such a contention in my
Essay on the Genuine Meaning of Beauty. Everything sublime and inspiring about this vast world of ours is such due to pattern, proportion, precision, and logic. What I had elucidated here was a new mathematical relationship between fundamental Pythagorean triples and inscribed circles, an infinite new treasure chest of ideas for artists, architects, and graphic designers to explore. Every one of these proportions between radius and triple is distinct and unique, yet each can be fathomed and employed by means of three simple algorithms. Here is my challenge to the artistic community: integrate this property into your endeavors! Build buildings with it, furnish intricate visual scenery in painting and mosaics, or perhaps, using a computer, expand its beauty and complexity beyond the power of the unarmed human hand. Tap its potential, and, instead of arbitrary whimsical paradigm shifts, furnish yet another magnificent leap of progress for Man in the noblest of aesthetic and technical realms.

G. Stolyarov II is a science fiction novelist, independent philosophical essayist, poet, amateur mathematician, composer, contributor to Enter Stage Right, Le Quebecois Libre, Rebirth of Reason, and the Ludwig von Mises Institute, Senior Writer for The Liberal Institute, and Editor-in-Chief of The Rational Argumentator, a magazine championing the principles of reason, rights, and progress. His newest science fiction novel is Eden against the Colossus. His latest non-fiction treatise is A Rational Cosmology. Mr. Stolyarov can be contacted at gennadystolyarovii@yahoo.com.

This TRA feature has been edited in accordance with TRA’s Statement of Policy.

Click here to return to TRA's Issue X Index.

Learn about Mr. Stolyarov's novel, Eden against the Colossus, here.

Read Mr. Stolyarov's new comprehensive treatise, A Rational Cosmology, explicating such terms as the universe, matter, space, time, sound, light, life, consciousness, and volition, at http://www.geocities.com/rational_argumentator/rc.html.

 

 

 

 

 

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