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"operations theory" » "operators theory", "observations theory", "relations theory"
"operator theory" » "operators theory", "operation theory"

1
by Schilling, René L., Song, Renming, Vondracek, Zoran
Published 2009
De Gruyter
... theory, potential theory, operator theory, integral equations, functional calculi and complex analysis...

2
by Schilling, René L., Song, Renming, Vondracek, Zoran
Published 2012
De Gruyter
... theory, operator theory, functional analysis and complex analysis - often with different definitions...