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1 Answer

1 votes
1 votes

1)

Basic Point:-  e * a = a ( where e identity element )

let take bl is left identity and br is right identity

∴ bl * a = a and a * br = a ====> bl * a = a * br ====> where a is an integer, therefore you can cancel them

            ∴ bl = br

2)

Basic Point:-  a-1 * a = e ( where e identity element )

let take bl is left inverse element and br is right inverse element

∴ bl * a = e and a * br = e ====> bl * a = a * br ====> where a is an integer, therefore you can cancel them

            ∴ bl = br

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