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objects to which the geometrical notions could be corresponded.We point out to one interesting analogy which, in our view testifies to the geometrical interpretation of spin.

Let's recall that according Pauli principle the two identical

particles with half-integral spin (fermions) cannot be simultaneously in the same quantum state. The alternative of Pauli principle maintains that in one and the same quantum state any number of particles (bosons) with integral spin could be found (infinitely much in the limit). Thus, the two similar fermions can't be found in the same space point. For bosons the situation is quite

different.

The remarkable fact: when in one case in one and the same place of space one can't put more than one particle and in the other-infinitely much, which gives a hint that spin has a some-what geometrical sense. To speak in images the spin in one case creates very "tight", and in the other case - very "spacious" space. Why so? To this question we cannot now give an answer which speaks for necessity to find an answer in the geometrical notions.

That's why we proceed to the geometry and study some facts reminding us the situation with fermions and bosons.It is well-known that besides the Euclidean geometry there are other geometrical systems (Lobachevsky, Riemannian geometry).

According to Klein's interpretation, which is based on the

projective geometry, the Euclidean, Lobachevsky and Riemannian geometry’s are in the unified scheme. The most known indication toidentify the latter two geometry is: in the Riemannian geometry(elliptical) across given point can't draw a straight line which couldn't cross the given straight line (analogy with the fermion)and in the Lobachevsky geometry (hyperbolic) across every point the infinite set of straight lines is passing, not intersecting with the given hyperbolic straight line (the analogy with bosons).

The analogy yet proves nothing. But in this case this is the fact that requires close consideration, study and discussion.The suspicion arises that spin is the sign of elementary particle pointing out to its non-Euclidean nature. May be the zero curvature of our space develops from total positive and negative curvaturesof spaces created by fermions and bosons? Not this is a key tounderstand "the space-time foam", idea which was put forward by Wheeler and Hawking? Couldn't this approach help to solve the cosmological problems?

Yuri Danoyan