Market concentration in the S&P 500 is at historic highs, with top holdings dominating index performance and risk exposure.

Investors may be at risk of being “blindsided” by market changes if the concentrated side of the market starts to unwind, ...

We study the compactness of a sequence of weak solutions to the (p-th power) nonlinear Klein-Gordon equation with uniform natural energy bounds. A refinement of the Rellich's Theorem of compact ...