Passando a limpo: um passeio pelos processos e pelos projetos de revitaliza？？o urbana do Meatpacking District, em Nova York, e da Regi？o da Luz, em S？o Paulo

the text below is part of a comparative study between the urban revitalization process of the "meatpacking district" in new york city, and the urban revitalization projects of regi？o da luz, in sao paulo, brazil. the article's objectives are to undertake a critical overview of the main urban sociology theories and to reflect about the ways in which comtemporary sociology is being in need of a revision of its definitions about what cities are. this analysis considers the processes of urban revitalization and gentrification, that are becoming more frequent in cities all over the world.