Lezione n°13
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In a list of distinct positive integers, say that an entry a is left-full if the entries to the left of a include 1,.. Show that the number of arrangements of n elements from
Since the line r is not parallel to the axis of any parabola ∂S jk , it follows that the intersection of r with S jk , is a segment (possibly empty or just a single point)..
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Solution proposed by Roberto Tauraso, Dipartimento di Matematica, Universit`a di Roma “Tor Vergata”, via della Ricerca Scientifica, 00133 Roma, Italy. There is a well known formula