Anything that can be offered to a market for attention, acquisition, use or consumption. Satisfies a want or a need. Includes: –Physical Products –Services –Persons –Places

3.1矩阵的秩 1.子式:在An中,选取k行与k列,位于交叉处的k2个数按照原来的 相对位置构成k阶行列式,称为A的一个k阶子式,记作D 对于给定的k,不同的k阶子式总共有C个 2.矩阵的秩:在A中,若 (1)有某个r阶子式D,≠0; (2)所有的r+1阶子式D+1=0(如果有r+1阶子式的话) 称A的秩为r,记作 rankA=r,或者r(A)r.规定:rank0=0 性质:(1) rankA min{m,n}

12.3.2用一个多项式的根和另一个多项式计算结式的公式 命题设 f(x)=ax+a1x-+…+an(a≠0 (x) box\+b- + (bo=0) 如果f(x),g(x)在C[x]中的分解式为 g()= bo (x-B) ).(x-)(1) 那么 R(f,g)=ag(a)=(-1)f(B)(*) 证明在数域K上的n+m+1元多项式环K[x,y1yn21m]中,令 f(x,y,yn)=a(x-y)…(x-yn)(2) g(x,z1,m)=b(x-z)…(x-m)(3)

The geometry is a set of hexahedral solids which have a logical representation. Each block in the geometry is called a ‘solid’. Each solid in the geometry can represent a fluid, porous or solid region

A cell membrane with a specific permeability and also electrical properties: channels are proteins in a lipidic environment

一、消费者偏好假定及图示 1.完备性假设 对于任何两种商品组合A和B，消费者总是能够明确地说出他的偏好程度：或 者A比B要好，或者B比A要好，或者A与B是无差异的，三者必居其一。换言之， 消费者能够给不同的商品组合按照偏好排列一个顺序

Part One: Early American Literature (1620-1770) Chapter 1: The Seventeenth Century Literature (also called the colonial literature) 1. American Puritanism: American Puritanism was one of the most enduring shaping influences in American thought and American literature. It has become, to some extent, so much a state of mind, rather than a set of tenets, so much a part of the national cultural atmosphere that the American breathes, that we may state with a degree of safety that, without some

Improving performance of coherent coded It can be shown that if the channel estimates are perfect(a1=a1, a2 OFDM systems using space time transmit a2)diversity can be achieved

Interaction diagrams are used to model the dynamic aspects of a software system They help you to visualize how the system runs. An interaction diagram is often built from a use case and a class diagram. —The objective is to show how a set of objects accomplish the required interactions with an actor

The recurring aspects of designs are called design patterns. A pattern is the outline of a reusable solution to a general problem encountered in a particular context Many of them have been systematically documented for all software developersto use