simple function
complex function on a measurable space that is piecewise constant with a finite number of measurable regions
en-GB/ˈsɪmpl ˈfʌŋkʃn/
en-US/ˈsɪmpəl ˈfʌŋkʃən/
complex function on a measurable space that is piecewise constant with a finite number of measurable regions