képlete

Képlet is a Hungarian term used to denote a concise symbolic expression that encodes a relationship, rule, or composition. It is employed across mathematics, science, and computing to represent formulas or prescriptions in a compact form. The plural form is képletek.

In mathematics, a képlet expresses a rule or relation using variables and constants. For example, the másodfokú képlet (quadratic formula) provides a direct way to compute the roots of a quadratic equation: x = (-b ± sqrt(b^2 - 4ac)) / (2a). In this sense, a képlet is a compact representation of a computational procedure or dependency.

In chemistry, képlet refers to the chemical formula that describes the composition of a substance, indicating the kinds and counts of atoms in a molecule or compound. Common examples include H2O for water and CO2 for carbon dioxide. The chemical képlet communicates the relative ratios of elements in a substance.

In computing and data tools, a képlet is the formula entered into a cell or field to compute a value. Spreadsheet software uses képletek such as =SUM(A1:A10) or =A1+B1 to produce results based on input data. These operational képletek enable dynamic calculations and data manipulation.

There is a distinction between képlet and the term egyenlet. A képlet is a defined expression that can be evaluated, while egyenlet is an equation asserting equality and often intended to be solved for unknowns. A képlet may be explicit or functional, providing mappings from inputs to outputs.

See also: mathematics, chemistry, computer science, spreadsheets.