Does this math formula with $1/PI\begin{cases}^\infty_{-\infty}\end{cases}$ mean anything?

Question

I happened upon an image on the Internet

_{(source: news.com.au)}

and I wondered whether the math on the chalkboard means anything. Using Google's image search, I found three other related images.

_{(source: nees.org)}

Piecing together the math from the various angles shows some mismatched grouping symbols.

My question: Ignoring the possible typos, does the "math" mean anything? Or is this an example of stock photography trying to appear mathy?

Answer 1

Googling fourier "a(y)" "b(y)" yields this first hit:

Answer 2

It's safe to say that the math doesn't mean anything. No branch of mathematics or science or anything else uses the symbol $\{$ for an integral sign, and there are mismatched parentheses.