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草产品连续五年“长盛不衰”
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作者 赵良 《现代农业科学》 2005年第9期17-17,共1页
前不久,有关部门进行的一项草产品专项调查显示,2004-2005年,我国生产的草产品(包括鲜紫花苜蓿、干草、干草粉、草捆、草块、草颗粒、饲料砖等)在国内外市场上连续五年畅销不衰,需求量每年以10%的速度递增。由于产不足需,供需矛盾尖锐。
关键词 畅销不衰 草粉 专项调查 草捆 草业生产 农民收人 种植结构调整 产品价格 畴象 于产
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Clustered Hyperbolic Categories
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作者 Ibrahim Saleh 《Algebra Colloquium》 SCIE CSCD 2018年第1期81-106,共26页
We introduce a class of categories, called clustered hyperbolic categories, which are constructed from a categorized version of preseeds called categorical preseeds using categorical mutations that are a "functorial... We introduce a class of categories, called clustered hyperbolic categories, which are constructed from a categorized version of preseeds called categorical preseeds using categorical mutations that are a "functorial" edition of preseed mutations. Every Weyl preseed p gives rise to a categorical preseed P which generates a clustered hyperbolic category; this is formed by copies of categories each one of which is equivalent to the category of representations of the Weyl cluster algebra H(p). A "categorical realization" of Weyl cluster algebra is provided in the sense of defining a map Fp from any clustered hyperbolic category induced from p to the Weyl cluster algebra H(p), where the image of Fp generates H(p). 展开更多
关键词 cluster algebras Weyl cluster algebras representations theory categorification of generalized Weyl algebras
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