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Need help with vector space multiple choice 
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#1
Jan2110, 01:42 PM

P: 1

Determine whether the given set S is a subspace of the vector space V.
A. V=P5, and S is the subset of P5 consisting of those polynomials satisfying p(1)>p(0). B. V is the vector space of all realvalued functions defined on the interval [a,b], and S is the subset of V consisting of those functions satisfying f(a)=f(b). C. V=ℝn, and S is the set of solutions to the homogeneous linear system Ax=0 where A is a fixed m×n matrix. D. V=Mn(ℝ), and S is the subset of all n×n matrices with det(A)=0. E. V=P4, and S is the subset of P4 consisting of all polynomials of the form p(x)=ax3+bx. F. V=C2(I), and S is the subset of V consisting of those functions satisfying the differential equation yʺ=0. G. V=ℝ3, and S is the set of vectors (x1,x2,x3) in V satisfying x19x2+x3=8. 


#2
Jan2110, 02:26 PM

P: 612

S is a subspace of V if, (1) S is closed under addition (given two elements a and b in S, a+b is in S) and (2)S is closed under scalar multiplication (given x in S, and a scalar c, cx is in S).
For each question you should see if the set satisfies these two criteria. If it doesn't then find a counterexample. For example problem D, does detA = 0 = detB mean that det(A+B) = 0? 


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