The notation "y = h(x)" in math refers to a function representation. "h" is the name of the function, "x" is the input to the function, and "y" is the output of the function. Essentially, it's saying that the value of "y" is determined by applying the function "h" to the input "x". For example, if h(x) = 2x + 3, then y = h(x) would be y = 2x + 3.
However, "y he" doesn't seem to represent a typical mathematical term or operation. It could be a typo or it might require more context to provide a more accurate interpretation.