[Turkmath:2970] biraz tarih...

[yilmaz akyildiz]

"... *My office in Ankara was next to that of Cahit Arf, and when I
mentioned the question to him, he drew my attention to a paper of Hasse
that had appeared in a journal not widely read, the* Acta Salmanticensia *of
1954. He fortunately had a reprint. So I could begin to think seriously
about the matter. The critical idea came in April 1968 in a hotel room in
Izmir, where I had gone to deliver a lecture. It was the understanding that
all identities needed were consequences of four basic ones, formulated in
the notes as the four main lemmas. Once this is understood and basic facts
about Gauss sums are understood, as in the papers of Lamprecht and
Davenport-Hasse, three of these four identities are not so difficult to
establish. The second main lemma turned out, on the other hand, to be a
major obstacle. Fortunately while leafing idly through journals in the
library, either in Ankara or later in New Haven (I no longer remember), I
came across Dwork's paper in which the first and the second main lemmas
were proved. Dwork had indeed tried to establish a product formula for what
has come to be called the ϵϵ-factor..."*
*Robert Langlands*

*http://publications.ias.edu/rpl/section/22
<http://publications.ias.edu/rpl/section/22>*
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