— With the invention of the nurse, — writes Golomb, — before me at once there were two questions. 1) whether it is possible to bypass a course of the nurse all cages of a chessboard so that on one of them not to visit twice? 2) At skolkih nurses another's child will be without supervision? (More accurate information of the second question says: to that equally poppy -

Inclination of roots of the fifth degree. At first sight can seem, as if this problem is even more difficult, than extraction of cubic roots, however actually to calculate roots of the fifth degree easier and easier. The matter is that last figure of any number coincides with last figure of its fifth degree. For search of the first figure it is enough to remember the right column of the table resulted on p

Nevertheless great mathematicians quite often differed ability instantly to make in mind the most complicated calculations. For example, Charles Fridrih Gauss made calculations with such speed and so it is skilful, that any variety calculator could envy it. Not without vanity he liked to say about itself(himself), that has learnt to calculate earlier, than to speak. Somehow time father Gaussa taking podrjady on civil work, counted up, how many it should pay to the masons for a week

One of the best ways such "dishonest" trisektsii has been found out in Archimedes works. We will assume, that it is required to make trisektsiju corner AEO (fig. 107). We will spend a semicircle with the centre in vertex of angle E and we will continue to the right party EE

* Mathematics Magazine, 34 (September — October 1960), p. 1—4.

Hobby Eshera for freakish forms of the bodies studied in topology, has found reflexion in a number of its later works. On an engraving "Knots" (fig. 94) we see mirror symmetric two knots known under the name "trilistnik". The left knot "is made" of two strips crossed under a right angle

Figure R so (a course 7), that wins: though three yet not occupied site of a board are great enough, that on them it was possible to place figures pentamino, unique three figures of the necessary configuration — I, the River and and — are already used.

CHAPTER 5

Having sat down on hinder legs and having twisted with a tenacious tail a branch, with such kind as if to it have just appropriated a rank of the honourable citizen, looks the monastery binturong Binti. It is most of all similar to carelessly made rug to which one end have sewn strange east head with long fluffy ears and convex round, senseless enough eyes. The next cage seems empty, but it is necessary to spend a finger on a grid, and immediately from vystlannogo box straw, on-kanareechi chirping and chirping, pours out group of tiny monkeys

Here also will lodge? And having got used to do without a tail, it even will entertain other travellers the numbers.

— Yes-yes, — members of council have picked up, — she sleeps, as the person.

In Bafute at us by the travel end has gathered seventeen monkeys (not including humanoid and more primitive representatives of group of primacies, such as potto and galago), and they were for us an inexhaustible source of entertainments. Perhaps, most picturesque of them red monkeys, growth they from a terrier, with an is bright-red wool, a black muzzle and a white breast. On an ox they prefer savanna to woods, go, as dogs, the big flights, diligently examine rhizomes of grasses and rotten trunks in search of insects or the bird's nests, overturn stones under which can be hearts, scorpions, spiders and other delicacies

I have sent people behind branches and have placed them so that they closed a bird from direct beams of the sun. But Vudi obstinately showed us a back. It was clear, that if I wish it to remove, it is necessary to rearrange and come all on the other hand. By considerable work we have transferred about ton of live scenery

The most fascinating on zoological expedition consists for me in daily close dialogue with a stomach-nyvsh that allows you to observe, learn and write down. In our collection every day, almost every minute there was something new and interesting. A little Eyderzhek from a diary brightly testify, as day of the hunter is sated by new problems and the important supervision.

We continued a way to Bafutu. By the end of day the sky became is pale-golden, then the sun has left for distant mountains, and all world was shrouded in a cool green twilight. Already in darkness the lorry with a roar has rounded last turn and has stopped in centre Bafuta, near Background manor. At the left the wide court yard was stretched, houses of wives and children of the Background further have crowded