An important case is when the curve is the graph of a real function (a function of one real variable and returning real values).
For some filter classes, such as the Butterworth filter, the insertion loss is still monotonically increasing with frequency and quickly asymptotically converges to a roll-off of 6n dB/8ve, but in others, such as the Chebyshev or elliptic filter the roll-off near the cut-off frequency is much faster and elsewhere the response is anything but monotonic.
In 1996, Asymptote built their first project overseas, the Universe Theatre in Aarhus, Denmark.
Van der Heide joined the Arup practice in 2004, and subsequently worked on projects including Star Place in Taiwan and Galleria West in South Korea, both in collaboration with Ben van Berkel and the 2004 Architecture Biennale show in Venice in collaboration with Hani Rashid of Asymptote.