Assuming that the system (s,*) has an identity element ,prove that:

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SUMMARY

The discussion focuses on proving that the operation * in the system (S, *) is both associative and commutative, given that it has an identity element and satisfies the equation (a*b)*(c*d) = (a*c)*(b*d) for all elements a, b, c, d in S. Participants suggest starting with the commutative property by substituting two variables with the identity element. This approach leads to insights about the behavior of the operation under specific conditions.

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  • Familiarity with identity elements in mathematical operations.
  • Knowledge of associative and commutative properties.
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This discussion is beneficial for mathematics students, educators, and anyone interested in abstract algebra, particularly those studying group theory and its foundational properties.

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assuming that the system (s,*) has an identity element. if the equation
(a*b)*(c*d)=(a*c)*(b*d) holds for all a,b,c,d belongs to S ,

,prove that:* is associative and commutative .

I tried so much but with no good result !

any ideas ?
 
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Hi Maths Lover! :smile:

Try "commutative" first …

put two of a b c or d equal to the identity. :wink:
 
What happens if you take c and d equal to the identity?
 

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