Abstract Algebra
Let n ≥ 2. Show that Sn is generated by each of the
following sets.
(a) S1 = {(1, 2), (1, 2, 3), (1, 2, 3, 4), ..., (1,
2, 3,..., n)}
(b) S2 = {(1, 2, 3, ..., n-1), (1, 2, 3, ..., n)}
According to the Fundamental Theorem of Algebra, every
nonconstant polynomial f (x) ∈
C[x] with complex coefficients has a complex root.
(a) Prove every nonconstant polynomial with complex coefficients
is a product of linear polynomials.
(b) Use the result of the previous exercise to prove every
nonconstant polynomial with real coefficients is a product of
linear and quadratic polynomials with real coefficients.
Prove by induction that it follows from Fundamental Theorem of Algebra that every f(x) ∈ C[x] can be written into a product of linear polynomials in C[x].
In your Solutions to Pinters a Book of Abstract Algebra Chapter
8 Exercise H3 i can not understand in step 5 you get
(ab)(cd)=(dac)(abd). Can you show me in some detail how to get that
result please?
14. Extra Credit: Cayley’s Theorem is an important one in
advanced algebra. It says that “Every algebraic group is isomorphic
to some permutation group.” Demonstrate this to be true by finding
a permutation group (Sn, ∘ ) that is isomorphic to (ℤ3, +) for some
n.