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Linear Algebra test 2
material from 4.2
23
Mathematics
Undergraduate 2
10/24/2016

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Term
vector space
Definition
let V be a set of objects in which two operations (addition and scalar multiplication) are defined. if the listed properties (aka axioms) are satisfied for every u,v,and w in V and every scalar (real number c and d) then V is called a vector space
Term
u+v is in V
Definition
closure under addition
Term
u+v=v+u
Definition
commutative property
Term
u+(v+w)=(u+v)+w
Definition
associative property
Term
V has a zero vector such that for every u in V
Definition

u+0=u

additive identity

Term
for every u in V, there is a vector in V denoted by -u
Definition

such that u+(-u)=0

additive inverses property

Term
cu is in V
Definition
closure under scalar multiplication
Term
c(u+v)=cu+cv
Definition
distributive property
Term
(c+d)u=cu+du
Definition
distributive property
Term
c(du)=(cd)u
Definition
associative property of multiplication
Term
1u=u
Definition
multiplicative identity
Term
four things needed in order to have a vector space
Definition

1. set of vectors

2. set of scalars

3. 2 operations

even though the objects in vector space v are called vectors, the vectors in v could be matrices, or polynomials, or anything else that satisfies the axiom

Term
R
Definition
set of all real numbers
Term
R2
Definition
set of all ordered pairs
Term
R3
Definition
set of all ordered triples
Term
Rn
Definition
set of all n-tuples
Term
C(-infinity, infinity)
Definition
set of all continuous funtions defined (-inf., inf.)
Term
C[a,b]
Definition
set of all continuous functions defined on [a,b]
Term
P
Definition
set of all polynomials (anxn+an-1xn-1+...a1x1+a0)
Term
Pn
Definition
set of all polynomials of degree equal or greater to n
Term
Mm,n
Definition
set of all mxn matrices
Term
Mnxn
Definition
set of all nxn matrices
Term
properties of scalar multiplication
Definition

let v be an element of a vector space V1 and let c be any scalar then the following are true

1. 0*V=0

2. c*0=0

3. if cV=0, then c=0 or V=0

4. (-1)V=-V

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