Later, René Descartes (17th century) introduced the modern notation (for example, the use of x—see below) and showed that the problems occurring in geometry can be expressed and solved in terms of algebra (Cartesian geometry).
In a later era, René Descartes (17th century) presented the current notation (e.g., utilizing x—refer to the following passage) and illustrated that the issues encountered in geometry could be represented and resolved through the use of algebraic language (Cartesian geometry).