The article is devoted to the study of the growth and development of medicinal annual <i>Cota</i> <i>altissima</i> (L.) J.</span><span style="font-family:""> </spa...The article is devoted to the study of the growth and development of medicinal annual <i>Cota</i> <i>altissima</i> (L.) J.</span><span style="font-family:""> </span><span style="font-family:"">Gay and two-year-old <i>Arctium</i> <i>tome</i></span><i><span style="font-family:"">n</span></i><i><span style="font-family:"">tosum</span></i><span style="font-family:""> Mill., <i>Silybum</i> <i>marianum</i> (L.) Gaertn. belonging to the Asteraceae family in the soil and climatic conditions of the city of Bukhara. The germination of seeds in laboratory and field conditions was determined. Due to unfavorable weather conditions and late spring, the seeds were sown in May. The growth and development of plants was observed one month later. Despite these species, they continue to grow. <i>Cota</i> <i>altissima</i> formed buds and flowers, and <i>Arctium</i> <i>tome</i></span><i><span style="font-family:"">n</span></i><i><span style="font-family:"">tosum</span></i><span style="font-family:""> and <i>Silybum</i> <i>marianum</i> remained in the virginal age state. All species adapt to the unfavorable conditions of the city of Bukhara.展开更多
Let Kdenote the complete graph consisting of n vertices,every pair of which forms an edge.We want to know the least possible number of the intersections,when we draw the graph Kon the plane or on the sphere using cont...Let Kdenote the complete graph consisting of n vertices,every pair of which forms an edge.We want to know the least possible number of the intersections,when we draw the graph Kon the plane or on the sphere using continuous arcs for edges.In a paper published in 1960,Richard K.Guy conjectured that the least possible number of the intersections is 1/64(n-1)^(2)(n-3)^(2) if n is odd,or 1/64 n(n-2)^(2)(n-4)if n is even.A virgin road V_(n)is a drawing of a Hamiltonian cycle in Kconsisting of n vertices and n edges such that no other edge-representing arcs cross V.A drawing of Kis called virginal if it contains a virgin road.All drawings considered in this paper will be virginal with respect to a fixed virgin road V.We will present a certain drawing of a subgraph of K,for each n(≥5),which is"characteristic"in the sense that any minimal virginal drawing of Kcontaining this subdrawing satisfies Guy’s conjecture.展开更多
文摘The article is devoted to the study of the growth and development of medicinal annual <i>Cota</i> <i>altissima</i> (L.) J.</span><span style="font-family:""> </span><span style="font-family:"">Gay and two-year-old <i>Arctium</i> <i>tome</i></span><i><span style="font-family:"">n</span></i><i><span style="font-family:"">tosum</span></i><span style="font-family:""> Mill., <i>Silybum</i> <i>marianum</i> (L.) Gaertn. belonging to the Asteraceae family in the soil and climatic conditions of the city of Bukhara. The germination of seeds in laboratory and field conditions was determined. Due to unfavorable weather conditions and late spring, the seeds were sown in May. The growth and development of plants was observed one month later. Despite these species, they continue to grow. <i>Cota</i> <i>altissima</i> formed buds and flowers, and <i>Arctium</i> <i>tome</i></span><i><span style="font-family:"">n</span></i><i><span style="font-family:"">tosum</span></i><span style="font-family:""> and <i>Silybum</i> <i>marianum</i> remained in the virginal age state. All species adapt to the unfavorable conditions of the city of Bukhara.
文摘Let Kdenote the complete graph consisting of n vertices,every pair of which forms an edge.We want to know the least possible number of the intersections,when we draw the graph Kon the plane or on the sphere using continuous arcs for edges.In a paper published in 1960,Richard K.Guy conjectured that the least possible number of the intersections is 1/64(n-1)^(2)(n-3)^(2) if n is odd,or 1/64 n(n-2)^(2)(n-4)if n is even.A virgin road V_(n)is a drawing of a Hamiltonian cycle in Kconsisting of n vertices and n edges such that no other edge-representing arcs cross V.A drawing of Kis called virginal if it contains a virgin road.All drawings considered in this paper will be virginal with respect to a fixed virgin road V.We will present a certain drawing of a subgraph of K,for each n(≥5),which is"characteristic"in the sense that any minimal virginal drawing of Kcontaining this subdrawing satisfies Guy’s conjecture.
