- #1
Niles
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Homework Statement
I have a differentiation operator on P_3, and:
S = {p \in P_3 | p(0) = 0}.
I have to show that
1) D maps P_3 onto the subspace P_2
2) D : P_3 -> P_2 is NOT one-to-one
3) D: S -> P_3 is one-to-one
4) D: S -> P_3 is NOT onto.
The Attempt at a Solution
1) Ok, for this I look at the bases. The basis for P_3 is [x^2, x, 1] and since we are dealing with an differentiation operator, the new basis must be [x, 1] - which is the basis for P_2, which we wanted to show.
2) I have to show that ax^2+bx+c and 2ax+b can have the same values. Do I just choose some values and show that they are equal?
3 + 4) I have to show that 2ax + b and ax^2+bx+c cannot have same values?
I hope you can confirm/help me with this.
Thanks in advance.