Physics, Chemistry & Maths Glossary

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P

Peptides

These are compounds in which an amide bond connects the amino group of one alpha amino acid and the carboxyl group of another alpha amino acid. Such amide bond is called peptide bond. Peptide bond has planar geometry due to resonance imparting partial double bond character.

Period of constant function

Constant function is a special case of periodic function. Period of constant function can be any positive real number except zero.

Point of Inflexion

Point of inflexion is where the function crawls, i.e. it moves very slowly upwards or downwards. It appears as if the function has stagnated. Consider the function x³-6x²+12x-8 whose graph is shown below which looks stagnated around x-coordinate 2 which is the point of inflexion:

fig.

Ptolemy's Theorem

In a cyclic quadrilateral ABCD, AC.AD = AB.CD + BC.AD, i.e. product of the diagonals = sum of the products of the lengths of the opposite sides.

Ptolemy_Theorem.png