# Algebraic geometry, Oslo 1970; proceedings by F. Oort

By F. Oort

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Extra info for Algebraic geometry, Oslo 1970; proceedings

Example text

So we see t h a t m and n are merely the integers in the representation of alb in lowest terms. 4) that k is the side length of the congruent squares. 5) for m and n integers, always has solutions when d is a multiple of the GCD {a,b} [Courant and Robbins, 1941]. 5) has at least one solution for d > CN and that there are exactly CN/2 - 1 solutions for values of d less than CN. To complete this cycle of ideas, the GCD of any two integers a and b can be determined by expanding alb in a special class of compound fractions known as continued fractions, Rather than give a lengthy ex- 34 Chapter One planation of how to carry out this expansion, we will generate it for one typical example and leave it to the reader to generate examples of his or her own or study more extensive treatises on this subject [Khinchin, 1964], [Olds, 1963]: 840 611 229 611 = 1 611/229 611-2 + 153-2+ 1 229 229 229/153 229 153 = _76_ = 153 _ J _ 153/76 76 " ^ + 76 Since 76/1 leaves no remainder, this sequences of quotients ends and the GCD can be shown to be equal to the denominator of this quotient, or 1, which shows t h a t 611 and 229 are relatively prime.

Proportion in Architecture 29 scholar Tons Brunes who coined the term sacred cut. C. by Pythagoras and then through the Romans to medieval Europe. As the Watts point out in their article, To ancient geometers, the circle symbolized the unknowable part of the world (since its circumference was proportional to the irrational number IT) while the square represented the comprehensible world. Squaring a circle was a means of expressing the unknowable through the knowable, the sacred through the familiar.

It is also the proportion that seems to have been chosen, both consciously and unconsciously, by artists in all ages to scale human figures in their paintings. 14. A 6-foot British policeman with arms upraised provides the determining points of the red and blue series. If the policeman's upraised arm is given the value 2d/<\> on the blue scale while the top of his head is d, the remainder of the scale is completely determined and can be constructed by compass and straightedge. ) Le Corbusier made these lengths concrete by choosing d so t h a t it is the height of the 6-foot policeman (or 183 centimeters in the metric system).