In other words, sharply curved space-time can give rise to the creation of real pairs with positive mass-energy, a fact first demonstrated in the context of black holes by the English astrophysicist Stephen W. Hawking.
For even n, the resulting decompositions of differential form representations of O↑ 2, n), the orthochronous conformal group, produce infinite families of unitary representations, the most interesting of which are carried by "positive mass-squared, positive frequency" quotients for 2l ⩾ ¦n − 2k¦.
The third stage of CAD schemes uses a variety of feature-based machine-learning classifiers to classify true-positive and false-positive mass regions.
MRI demonstrated a T1 hypointense, T2/fluid-attenuated inversion recovery hyperintense area in the left lower parietal lobe with a gadolinium-positive mass in the postcentral gyrus.
Many different types of classifiers, such as artificial neural networks (ANN), Bayesian belief networks (BBN), decision trees, support vector machines (SVM), and knowledge-based expert systems, are developed in an attempt to better classify true-positive and false-positive mass regions.
