' The London School of Economics and Political Science (University of London) Houghton Street, London, WC2A 2AE Telephone: 01-405 7686 Department of Economics SG/JM 28th June, 1976. Professor Steindl, A-llo3, "ien Postfach 91, AUSTRIA. Dear Professor Steindl, My reaction to your letter of 13th June was, it appears,too quick and ill-founded. Over the weekend I was trying to reproduce my original discussion of the equation: I (1) + where a, b and h are all non-negative, and a < 1. Unfortunately, I could not find my notes with the discussion (of ten years ago!), so that I have had to do it again. However, the results are different than I thought they were. Let 1^ = E e^. On substituting to (1) we have = a + b |jL-e^J a + i a) (2) e Let X = a + i a). Since e (3) a = e (cos a) + i sin a)) , we have a , . , -ha , e cos a) = a + b- be cos h a) t a\ a , -ha (4) e sin a) = b e a i + h From Eq.4 e = (b sin h w/sin ai) S n (w) . Svibstituting into (3) gives —h (5) <f> (to) = n (u) cos a) + b n (w) cos h ai = a + b Continued.. Tht London School of Economics and Folitical Science is incorporated in England as a company limited by guarantee Linder the Companies Acts (Reg. No. 70527) Registered Office as above