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If TL (n ,F) and STL(n,F) denote the (upper) triangular and special (upper) triangular groups of...

If TL (n ,F) and STL(n,F) denote the (upper) triangular and special (upper) triangular groups of degree n over G respectively , show that the commutator subgroup of TL(n ,F) is a subgroup of STL (n , F) while STL (n,F) is nilpotent of class n-1.

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this much i can derive

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