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Simple proofs of various fixed point and existence theorems based on exterior calculus
Author(s) -
Mawhin J.
Publication year - 2005
Publication title -
mathematische nachrichten
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.913
H-Index - 50
eISSN - 1522-2616
pISSN - 0025-584X
DOI - 10.1002/mana.200410325
Subject(s) - mathematics , mathematical proof , simple (philosophy) , quaternion , calculus (dental) , fixed point , point (geometry) , fixed point theorem , algebra over a field , pure mathematics , mathematical analysis , geometry , medicine , philosophy , dentistry , epistemology
Abstract Using an unpublished result of Tartar about some integrals depending upon a parameter, we give quite elementary proofs of various fixed point theorems and of the fundamental theorems of algebra for complex numbers and quaternions. (© 2005 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)