Mathematics
OpenStudy (anonymous):

What is a shadow generating function?

OpenStudy (anonymous):

OpenStudy (anonymous):

and on what?

OpenStudy (anonymous):

Sounds like you're describing vector projection...

OpenStudy (anonymous):

Oh wow... interesting. Never heard of that.

OpenStudy (asnaseer):

Basically it states: A "shadow function" to $$y_1$$ is another quadratic $$y_2$$ which shares the same vertex as $$y_1$$. However $$y_2$$ has opposite concavity to $$y_1$$ and its zeros are in the form $$a\pm b$$.

OpenStudy (anonymous):

That document is exactly what i'm working from... the question i'm referring to is "Hence, or otherwise, express y2 in terms of y1 and ym , where ym is called the “shadow generating function”." But I don't know how to get ym if i don't know what a shadow generating function is.