See also: incorporation. INFUSION, med. jur. A pharmaceutical operation, which consists in pouring a hot or cold fluid upon a substance, whose medical properties it is desired to extract. Infusion is also used for the product of this operation.
A proportion is an equation with a ratio on each side. It is a statement that two ratios are equal. 3/4 = 6/8 is an example of a proportion. When one of the four numbers in a proportion is unknown, cross products may be used to find the unknown number.
(Note: an expression doesn't have a solution set!) You would never say that two equations are equal, because that would get very confusing! Two sets are equivalent when they have the same cardinality (number of elements); they are equal when they are actually the same set (consisting of the same elements).