Math is more than formulas and equations. The residue masses are calculated from the tabulated chemical formulas and atomic weights. A series of entropy production formulas can be derived. Parabens are effective preservatives in many types of formulas. There are hundreds of Chinese classic herbal formulas. The scroll contains some 700 magical formulas and folk remedies. Spherical functions have a few recurrent formulas. In chemistry, isomers are ions or molecules with identical formulas but distinct structures. There are many conventions for where parentheses are used in formulas. Errors in the theoretical formulas used are secondary. The terminology of these formulas is not quite standardised. There are examples of norms that are not defined by "entrywise" formulas. Below are the formulas and corresponding proof. All of the area formulas for general convex quadrilaterals apply to parallelograms. There are many proofs of the above formulas.