By Pierre Antoine Grillet

ISBN-10: 0387715673

ISBN-13: 9780387715674

ISBN-10: 0387715681

ISBN-13: 9780387715681

A thoroughly remodeled new version of this awesome textbook. This key paintings is geared to the desires of the graduate scholar. It covers, with proofs, the standard significant branches of teams, jewelry, fields, and modules. Its inclusive method signifies that all the invaluable components are explored, whereas the extent of aspect is perfect for the meant readership. The textual content attempts to advertise the conceptual realizing of algebra as a complete, doing so with a masterful snatch of technique. regardless of the summary material, the writer incorporates a cautious number of vital examples, including a close elaboration of the extra refined, summary theories.

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**Example text**

The canonical projection π : FX −→ X R is a homomorphism that extends ι to FX , since π ◦ η = ι ; therefore it is the homomorphism that 7. Presentations 33 extends ι to FX . If (u, v) ∈ R , then u v −1 ∈ N = Ker π , π (u) = π(v) , and (u, v) holds in X R via ι. Every element g of X R is the image under ϕ of an element a of F ; a is a product of elements of X and inverses of elements of X ; hence g is a product of elements of ϕ(X ) = ι(X ) and inverses of elements of ι(X ) . Definitions. X R is the (largest) group generated by X subject to every relation (u, v) ∈ R .

A, b a 2 = 1, b2 = 1, (ab) = 1 ; prove that you have the required group. Do you recognize this group? 12. List the elements and draw a multiplication table of the group 3 13. List the elements and draw a (compact) multiplication table of the group a, b a 2 = 1, b2 = 1 ; prove that you have the required group. 14. Show that a group is isomorphic to Dn if and only if it has two generators a and b such that a has order n , b has order 2 , and bab–1 = a –1 . 15. The elements of H can be written in the form a + v , where a ∈ R and v is a three-dimensional vector.

7 characterizes the free group on X up to isomorphism. (Let F be a group and let j : X −→ F be a mapping. Assume that for every mapping f of X into a group G , there is a homomorphism ϕ of F into G unique such that f = ϕ ◦ j . ) 5. Show that every mapping f : X −→ Y induces a homomorphism Ff : FX −→ FY unique such that Ff ◦ η X = ηY ◦ f (where η X , ηY are the canonical injections). Moreover, if f is the identity on X , then Ff is the identity on FX ; if g ◦ f is defined, then Fg◦ f = Fg ◦ Ff .

### Abstract Algebra by Pierre Antoine Grillet

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