Remember, every light field is described mathematically by a positive and a negative frequency. If we just consider the positive frequency component, then there are four solutions to the equation.

A weak negative, downhill-sloping linear relationship 0. No linear relationship +0.30. A weak positive, upward-sloping linear relationship +0.50. A moderate positive, upward-sloping linear ...

J. Mercer, Functions of Positive and Negative Type, and their Connection with the Theory of Integral Equations, Philosophical Transactions of the Royal Society of London. Series A, Containing Papers ...

SHU TANG LIU, BING GEN ZHANG, GUANRONG CHEN, ASYMPTOTIC BEHAVIOR AND OSCILLATION OF DELAY PARTIAL DIFFERENCE EQUATIONS WITH POSITIVE AND NEGATIVE COEFFICIENTS, The Rocky Mountain Journal of ...