ΘΣ - d^3∑x^2
Having problems solving this.
All I know so far is that I have a hyperbolic polaroid and that I subtract a d particle multiplied by ∑x^2.
Until you define what you mean by each of those symbols it is impossible for anyone to know what the "problem" is!
(Frankly I am tempted to think the whole thing is a stupid joke! A 'hyperboid polaroid"? A "d particle"?)