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Let k be a knot in S 3 . There is an epimorphism from π 1 (S 3 −k) onto a free product of two nontrivial cyclic groups sending a meridian to an element of length two iff k has property Q (Topology of Manifolds, Markham, Chicago, IL, 1970, pp. 195–199) that is if there is a closed surface F in S 3 containing k, such that k is imprimitive in H 1 (X) and in H ...
A study was carried out in the rural areas of the state of Guanajuato in Central Mexico to identify the way in which two different types of farmer store and use their maize and bean production. One of these groups of farmers utilizes a communal type of land named ejido, whereas the others own their property. It was found that the ejido farmers store between 1-2 tons of these basic products, to be...
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