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Elements Of Modern Algebra
8th Edition
ISBN:9781285463230
Author:Gilbert, Linda, Jimmie
Publisher:Gilbert, Linda, Jimmie
Chapter4: More On Groups
Section4.8: Some Results On Finite Abelian Groups (optional)
Problem 14E: Suppose that the abelian group G can be written as the direct sum G=C22C3C3, where Cn is a cyclic...
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C. (3 points each) Determine whether the binary operation gives a group structure on a given
set by showing that this structure satisfies the group axioms. If no, identify the group axiom
that does not hold, and determine if it forms a semigroup or a monoid on a given set.
(11) The pair (Z, *) in which a y = r +y +ry.
(12) The pair (R+, *) in which r* y = VTy.
(13) The pair (Q. *) in which r*y = (r+y)/3.
(14) The pair (R × R, +) in which (w, z) * (y, z) = (wz + ry, rz).
(15) The pair (Q-{-1}, +) in which ry = r + y + xy.
Transcribed Image Text:C. (3 points each) Determine whether the binary operation gives a group structure on a given set by showing that this structure satisfies the group axioms. If no, identify the group axiom that does not hold, and determine if it forms a semigroup or a monoid on a given set. (11) The pair (Z, *) in which a y = r +y +ry. (12) The pair (R+, *) in which r* y = VTy. (13) The pair (Q. *) in which r*y = (r+y)/3. (14) The pair (R × R, +) in which (w, z) * (y, z) = (wz + ry, rz). (15) The pair (Q-{-1}, +) in which ry = r + y + xy.
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