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We develop in this article the principal constructive arguments used inquantum field theory, limiting us to bosonic theories, for which there does notexist any recent general presentation. The article is primarily written formathematicians or mathematical physicists knowing the basic arguments ofquantum field theory, and desiring to discover a general framework in whichthey can be made rigorous. It also provides a glimpse of a recent series ofarticles \cite{MagUnt1,MagUnt2} whose aim is to give a constructive definitionof rough paths and fractionary stochastic calculus.

Mode d'emploi de la th\'eorie constructive des champs bosoniques (A user's guide to bosonic constructive field theory)