1) Let A be an m × n matrix. Find all b such that the set of solutions to Ax = b is a subspace and prove your claim.

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
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Chapter2: Second-order Linear Odes
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1) Let A be an m × n matrix. Find all b such that the set of solutions to Ax = b is a subspace and prove your claim.

2) Prove or disprove: If T is 1-1, then T^2 is 1-1.

3) Prove or disprove: If T^2 is 1-1, then T is 1-1.

4) Prove or disprove: R^2 with coordinate-wise addition and scaling defined as c(x1, x2) = (x1, 0) is a vector space.

5) Suppose {v1, ..., vn} is a basis for V . Find conditions on c1, ..., cn so that {c1v1, ..., cnvn} is a basis for V and prove your claim.

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   Let w=x Ax=b m+n       claim w ia subspace iff b=0       pf  if b=0 then        w=x A x=0      Let x,yw  & α If      Then Ax=0,  Ay=0      Aαx+y=0      α x+y w

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