By P.R. Halmos
From the Preface: "This publication used to be written for the lively reader. the 1st half involves difficulties, often preceded by means of definitions and motivation, and infrequently by way of corollaries and historic remarks... the second one half, a really brief one, comprises hints... The 3rd half, the longest, contains options: proofs, solutions, or contructions, looking on the character of the problem....
This isn't an creation to Hilbert area conception. a few wisdom of that topic is a prerequisite: not less than, a examine of the weather of Hilbert house thought should still continue simultaneously with the studying of this book."