If, the Krein space is called a Pontrjagin space or -space. (Conventionally, the indefinite inner product is given the sign that makes finite.) In this case is known as the number of positive squares of . Pontrjagin spaces are named after Lev Semenovich Pontryagin.
Read more about this topic: Indefinite Inner Product Space
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“A set of ideas, a point of view, a frame of reference is in space only an intersection, the state of affairs at some given moment in the consciousness of one man or many men, but in time it has evolving form, virtually organic extension. In time ideas can be thought of as sprouting, growing, maturing, bringing forth seed and dying like plants.”
—John Dos Passos (1896–1970)
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