- #1
stunner5000pt
- 1,461
- 2
Determine if this is a vector space with the indicated operations
the set of V of all polynominals of degree >=3, togehter iwth 0, operations of P (P the set of polynomials)
now all the scalar multiplication axioms hold.
the text however says that the axion
[tex] \mbox{For u,v} \in V, \mbox{then} \ u+v \in V [/tex] does not hold
well ok take two polynomials
[tex] u(x) = a_{3} x^3 + ... + a_{n} x^n [/tex]
[tex] v(x) = b_{3} x^3 + ... + b_{k} x^k [/tex]
where both n,k>= 3, then suppose k< n
[tex] u(x) + v(x) = (a_{3} + b_{3}) x^3 + ... + (a_{k} + b_{k}) x^k + ... + a_{n} x^n [/tex]
which is certainly a polynomial or degree >= 3 isn't it?
It also applies for n<k and n = k
is the textbook wrong?
the set of V of all polynominals of degree >=3, togehter iwth 0, operations of P (P the set of polynomials)
now all the scalar multiplication axioms hold.
the text however says that the axion
[tex] \mbox{For u,v} \in V, \mbox{then} \ u+v \in V [/tex] does not hold
well ok take two polynomials
[tex] u(x) = a_{3} x^3 + ... + a_{n} x^n [/tex]
[tex] v(x) = b_{3} x^3 + ... + b_{k} x^k [/tex]
where both n,k>= 3, then suppose k< n
[tex] u(x) + v(x) = (a_{3} + b_{3}) x^3 + ... + (a_{k} + b_{k}) x^k + ... + a_{n} x^n [/tex]
which is certainly a polynomial or degree >= 3 isn't it?
It also applies for n<k and n = k
is the textbook wrong?