Let S be the set S= {a+bk: a,be R}, where k is a formal symbol. Define addition and multiplication operations on S as follows: given elements x = a+bk and y =c+dk in S, х+y:3 (а+c)+(b+d)k, ху:%3 (ас + bd) + (ad + be)k.

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
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Prove the multiplicative inverse law is false for S.

Let S be the set
S= {a+bk: a,b e R},
where k is a formal symbol. Define addition and multiplication operations on S as
follows: given elements x = a+bk and y =c+dk in S,
х+у:3 (а+с)+ (b+ d)k,
ху:%3 (ас + bd) + (ad + be)k.
Transcribed Image Text:Let S be the set S= {a+bk: a,b e R}, where k is a formal symbol. Define addition and multiplication operations on S as follows: given elements x = a+bk and y =c+dk in S, х+у:3 (а+с)+ (b+ d)k, ху:%3 (ас + bd) + (ad + be)k.
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