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Summary: rof. Fisher is considered,
together with Kenneth Wil-
son, Leo Kadanoff and Ben
Widom, one of the fathers
of the Renormalization Group (RG)
eory, probably the most important
theoretical development in Statistical
Physics in the last quarter of the 20th
century,that deserved a Nobel Prize in
Physics (1982, to Ken Wilson). For his
work in this field, Prof. Fisher was
awarded with the Wolf Prize (1980,
shared with Ken Wilson and Leo
Kadanoff), the Boltzmann Medal
(1983) and the Onsager Prize (1995).
During his visit to Madrid, Prof.
Fisher talked at length with the Royal
Spanish Physical Society (RSEF), and
in what follows we reproduce part of
that meeting as an interview. Most
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