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42 FERNANDO FERREIRA
Ulrich Kohlenbach and Paulo Oliva for innumerous conversations on the topics
of this work.
During the writing of these lectures, I was partially supported by cmaf,
poci2010/fct and feder.
Departamento de Matema´tica, Universidade de Lisboa Campo Grande, Edif´ıcio C6, P-1749-016 Lisboa, Portugal E-mail address: ferferr@cii.fc.ul.pt
