3

enter image description here

This is the exercise 11 in the Folland Real Analysis. Could anyone tell me what it means by f(x,・) and f(・,y)? I have never seen such notations before...

Martin Sleziak
  • 53,687
Keith
  • 7,673
  • 2
    $f(x,\cdot)$ is the name of the function $y\mapsto f(x,y)$. It is meant to resemble what happens with $f$ being the name of the function $x\mapsto f(x)$, in which the name is formed by making $(x)$ disappear. The $\cdot$ is left to indicate that something did disappear and to tell where was what disappeared. – Pp.. Jan 21 '15 at 17:39
  • 1
    See also here – icurays1 Jan 21 '15 at 17:46

0 Answers0