This text presents a collection of small essays containing the history
and the proofs of some important theorems of analysis and partial
differential operators from this century. Most of the results in the
book are associated with Swedish mathematicians. Also included are the
Tarski-Seidenberg theorem and Wiener's classical results in harmonic
analysis and an essay on the impact of distributions in analysis. All
mathematical points are fully explained, but some require a certain
mature understanding from the reader. This book offers full mathematical
treatment, along with insight and points of view.