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Lemma 29.1:

Suppose that $ 0\leq j < i \leq n$ then

$\displaystyle \Phi_j^{n}\circ \Phi_{i-1}^{n-1} = \Phi^n_{i} \circ \Phi_j^{n-1} \eqno(29.2) $


nisha 2012-03-20