Answer to Question #138979 in Abstract Algebra for Sohan kumar

Question #138979
Prove that R⁵/R² is isomorphic to R³.
1
Expert's answer
2020-10-19T16:47:17-0400

Let "f: R^{5}\\rightarrow R^{3}\\\\\nf(x_{1},x_{2},x_{3},x_{4},x_{5})=(x_{1},x_{2},x_{3},0,0)"

One can check that f is a homomorphism .

Moreover it is onto.

Kernel(f)="\\{(x_{1},x_{2},x_{3},x_{3},x_{4},x_{5})|f(x_{1},x_{2},x_{3},x_{4},x_{5})="(0,0,0,0,0)"\\}"

="\\{(0,0,0,x_{4},x_{5})|x_{4},x_{5}\\in R\\}" "\\cong R^{2}"

Therefore by 1st isomorphism theorem "R^{5}\/ R^{2}\\cong R^{3}"


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