We prove the existence of a maximum principle for operators of the type
@incollection{JEDP_1999____A3_0, author = {Hedenmalm, H\r{a}kan}, title = {An {Hadamard} maximum principle for the biplacian on hyperbolic manifolds}, booktitle = {}, series = {Journ\'ees \'equations aux d\'eriv\'ees partielles}, eid = {3}, pages = {1--5}, publisher = {Universit\'e de Nantes}, year = {1999}, mrnumber = {1718958}, language = {en}, url = {http://www.numdam.org/item/JEDP_1999____A3_0/} }
Hedenmalm, Håkan. An Hadamard maximum principle for the biplacian on hyperbolic manifolds. Journées équations aux dérivées partielles (1999), article no. 3, 5 p. http://www.numdam.org/item/JEDP_1999____A3_0/
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