[Zucht]

Oorspronkelijk geplaatst door Zucht

Er is een oud Grieks vraagstuk om het aantal koeien van één of andere God te berekenen. Weet niet meer aan wie het toegeschreven is, maar van voor de jaartelling dacht ik toch. De oplossing is eigenlijk niet te berekenen zonder computer die enorme getallen kan manipuleren, maar het heeft wel een oplossing en de uitkomst is een reusachtig groot getal. Ik zal bijtijds eens zoeken of ik het terug kan vinden.

Toen ik me weer de naam van de God herinnerde (Helios) was het snel gevonden op wikipedia.

Het raadsel komt van Archimedes en de kleinste oplossing is rond de :

7.760271406486818269530232833213886664232322405923 37610315062... x 10 tot de macht 206544 (dus een getal van 206545 nummers)

Het raadsel gaat als volgt:

If thou art diligent and wise, O stranger, compute the number of cattle of the Sun, who once upon a time grazed on the fields of the Thrinacian isle of Sicily, divided into four herds of different colours, one milk white, another a glossy black, a third yellow and the last dappled. In each herd were bulls, mighty in number according to these proportions: Understand, stranger, that the white bulls were equal to a half and a third of the black together with the whole of the yellow, while the black were equal to the fourth part of the dappled and a fifth, together with, once more, the whole of the yellow. Observe further that the remaining bulls, the dappled, were equal to a sixth part of the white and a seventh, together with all of the yellow. These were the proportions of the cows: The white were precisely equal to the third part and a fourth of the whole herd of the black; while the black were equal to the fourth part once more of the dappled and with it a fifth part, when all, including the bulls, went to pasture together. Now the dappled in four parts were equal in number to a fifth part and a sixth of the yellow herd. Finally the yellow were in number equal to a sixth part and a seventh of the white herd. If thou canst accurately tell, O stranger, the number of cattle of the Sun, giving separately the number of well-fed bulls and again the number of females according to each colour, thou wouldst not be called unskilled or ignorant of numbers, but not yet shalt thou be numbered among the wise.

But come, understand also all these conditions regarding the cattle of the Sun. When the white bulls mingled their number with the black, they stood firm, equal in depth and breadth, and the plains of Thrinacia, stretching far in all ways, were filled with their multitude. Again, when the yellow and the dappled bulls were gathered into one herd they stood in such a manner that their number, beginning from one, grew slowly greater till it completed a triangular figure, there being no bulls of other colours in their midst nor none of them lacking. If thou art able, O stranger, to find out all these things and gather them together in your mind, giving all the relations, thou shalt depart crowned with glory and knowing that thou hast been adjudged perfect in this species of wisdom.

De oplossing wordt hier uitgelegd:
http://www.math.nyu.edu/~crorres/Arc...ttle_vardi.pdf