Which of the following statements are true, and which are false? Give reasons for your answers.
i) For any ring R and .
ii) Every ring has at least two elements.
iii) If R is a ring with identity and I is an ideal of R, then the identity of R/I is the same as the identity of R.
iv) If is a ring homomorphism, then it is a group homomorphism from (R, +) to (S, +).
v) If R is a ring, then any ring homomorphism from into R is surjective.
i) Cannot determine as stated – The statement is incomplete; no specific equation is given. In general, whether an equation has a solution in a ring depends on the ring and the equation itself. ii) False – A ring can __________ _________ _________ ___ ____ ___ ____ __________ _____ _____ _____.
___ ______ __________ ___ ________.
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______ __________ __________ ___ ____ __________ ______ __________ ___ __________.
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केली प्रमेय की सहायता से एक ऐसा क्रमचय समूह ज्ञात कीजिए जो कि कोटि 12 वाले चक्रीय समूह के तुल्याकारी हो।
या H अपरिमित है;
Which of the following statements are true? Give reasons for your answers.
i) If a group G is isomorphic to one of its proper subgroups, then .
ii) If x and y are elements of a non-abelian group (G, ) such that , then
or
, where e is the identity of G with respect to $$.
iii) There exists a unique non-abelian group of prime order.
iv) If , where A is a group, then
.
v) If H and K are normal subgroups of a group G, then .
क) क्रमविनिमेय वलय R की गुणजावली I के लिए,, किसी
के लिए परिभाषित कीजिए। दिखाइए कि
यहाँ चित्र में दिए गए टेक्स्ट का लिखित रूप है:
i) की एक गुणजावली है।
ii) .
iii) कुछ स्थितियों में
।
ख) क्या वलय R की कोई भी दो गुणजावलियों I और J के लिए,
? अपने
उत्तर की पुष्टि कीजिए।
(5)
Prove that every non-trivial subgroup of a cyclic group has finite index. Hence prove that is not cyclic.
Prove that a cyclic group with only one generator can have at most 2 elements.
Give the smallest for which An is non-abelian. Justify your answer.