Henna, a vegetable extract, was one of the earliest known dyes and is still used as a reddener for hair; nitrate of silver and gum water, walnut juice, iron rust, vinegar - all sorts of recipes have been tried over the years...
A PDE system consisting of the momentum balance, mass balance, and energy balance equations for displacement, capillary pressure, and temperature as a model for unsaturated fluid flow in a porous viscoelastoplastic solid is shown to admit a solution under appropriate assumptions on the constitutive behavior.
Brazilian churrascaria just blocks from its competitor Fogo de Chão.
Another variation of the technique for changing radicals to simplest form is to prime factor the radicand and then to look for perfect squares in exponential form.
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