No Good Deed Unpunished

No News is Good News

It seems plausible that an increase in stock market volatility raises required stock returns, and thus lowers stock prices. We develop a formal model of this volatility feedback effect using a simple model of changing variance (a quadratic generalized autoregressive conditionally heteroskedastic, or QGARCH, model). Our model is asymmetric and helps to explain the negative skewness and excess ku...

NO news is good news.

NO news is good news for plants.

The organization of redox signaling and the use of nitric oxide (NO) to transmit information, modulate biological processes or create cellular damage are highly complex. Recent reports provide an exceptional picture of NO production, of the regulation of NO bioactivity through detoxification reactions and of biochemical events by which NO transduces signals into cellular responses, in particula...

On interval-subgradient and no-good cuts

Interval-gradient cuts are (nonlinear) valid inequalities for nonconvex NLPs defined for constraints g(x) ≤ 0 with g being continuously differentiable in a box [x, x̄]. In this paper we define intervalsubgradient cuts, a generalization to the case of nondifferentiable g, and show that no-good cuts (which have the form ‖x−x̂‖ ≥ ε for some norm and positive constant ε) are a special case of interva...

Namba forcing and no good scale

We develop a version of Namba forcing which is useful for constructing models with no good scale on אω . A model is produced in which אn holds for all finite n ≥ 1, but there is no good scale on אω ; this strengthens a theorem of Cummings, Foreman, and Magidor [3] on the non-compactness of