Abstract. This note is a complement to Pusz--Woronowicz's works on functional calculus for two positive forms from the viewpoint of operator theory. Based on an elementary, self-contained and purely Hilbert space operator explanation of their functional calculus, we show that any operator connection type operations (including any operator perspectives) are captured by their functional calculus.
AMS Subject Classification
(1991): 47A60; 47A64
received 3.1.2021, revised 28.8.2021, accepted 31.8.2021. (Registered under 13/2021.)