‎a $mu$-way $(v,k,t)$ $trade$ of volume $m$ consists of $mu$‎ ‎disjoint collections $t_1$‎, ‎$t_2‎, ‎dots t_{mu}$‎, ‎each of $m$‎ ‎blocks‎, ‎such that for every $t$-subset of $v$-set $v$ the number of‎ ‎blocks containing this t-subset is the same in each $t_i (1leq‎ ‎i leq mu)$‎. ‎in other words any pair of collections ${t_i,t_j}$‎, ‎$1leq i< j leq mu‎$ is a $(v,k,t)$ trade of volume $m$. in th...

In this paper, we present a complete classification of the simple 2-(v, 3) trades, for v = 6 and 7. For v = 6, up to isomorphism, there are unique trades with volumes 4, 6, and 10 and trades with volumes 7-9 do not exist; for v = 7, up to isomorphism, there exist two trades with volume 6, two trades with volume 7, two trades with volume 9, five trades with volume 10, and only one trade with vol...

one of the factors which causes the declining of human efficient performance is called burn - out, so it seems necessary to know this phenomenon. in this essay, first the different distinctive features of burn - out (emotional i physical wearing out, losing extremely the individual characteristics, declension of performance) separately have been defined. then, the structure of musleshand jackso...

In this paper, Steiner and non-Steiner 2-(v, 3) trades of minimum volume are considered. It is shown that these trades are composed of a union of some Pasch configurations and possibly some 2-(v, 3) trades with 6 ≤ v ≤ 10. We determine the number of non-isomorphic Steiner 2-(v, 3) trades of minimum volume. As for non-Steiner trades the same thing is done for all vs, except for v ≡ 5 (mod 6).

We review some of the salient results presented at this Workshop, together with some comments on the underlying physics, and the proposed facilities for future experiments. ISN 93–17 February 5, 2008. Invited talk at the Workshop on Spin and Flavour in Hadronic and Electromagnetic Interactions, Turin, September 1992, to appear in the Proceedings SPIN AND FLAVOUR: CONCLUDING REMARKS