Mettā ( in Devanagari) or maitrī () is loving-kindness, friendliness, benevolence, close mental union (on same mental wavelength), and active interest in others. It is one of the ten pāramīs of the Theravāda school of Buddhism, and the first of the four sublime states (Brahmavihāras). This is love without clinging (upādāna). The cultivation of loving-kindness (mettā bhāvanā) is a popular form of meditation in Buddhism. In the Theravadin Buddhist tradition, this practice begins with the meditator cultivating loving-kindness towards themselves, then their loved ones, friends, teac...

In mathematics, the Cauchy principal value, named after Augustin Louis Cauchy, is a method for assigning values to certain improper integrals which would otherwise be undefined. Formulation Depending on the type of singularity in the integrand f, the Cauchy principal value is defined as one of the following: * the finite number ::\lim_{\varepsilon\rightarrow 0+} \left[\int_a^{b-\varepsilon} f(x)\,\mathrm{d}x+\int_{b+\varepsilon}^c f(x)\,\mathrm{d}x\right] :where b is a point at which the behavior of the function f is such that ::\int_a^b f(x)\,\mathrm{d}x=\pm\infty :for any a \int_...