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  Category:Mathematical theorems – Wikimedia Commons

  https://commons.wikimedia.org/wiki/Category:Mathematical_theorems?uselang=de

  Keine Beschreibung vorhanden.

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  Advanced Linear Algebra - Steven Roman - Google Books

  http://books.google.de/books?id=bSyQr-wUys8C&pg=PA208&dq=triangle+inequality&as_brr=3

  This is a graduate textbook covering an especially broad range of topics. The first part of the book contains a careful but rapid discussion of the basics of linear algebra, including vector spaces, linear transformations, quotient spaces, and isomorphism…

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