, Let us now complete the denition of s in ij on the remaining parts of P. The missing case in (108) is when s in i (t, x) ? s in j (t, ?) and ? = x. However

.. For-j-?-{m-+-1, n}, we use the same function f given by (111) (in fact, the result then 759 directly follows from the intermediate value theorem)

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