A procedure associated with Pierre de Fermat for extrema and tangents. Compare expressions at and , remove common terms, divide by a remaining power of , and suppress terms still containing . Its interpretation must be distinguished from ordinary equality at finite and from a modern limit definition.[ref]
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Adequality is a term that originates from the field of mathematics, particularly in the context of non-standard analysis. It is used to refer to a notion of "equality" that connects concepts from standard mathematics with those from non-standard frameworks, especially in the study of infinitesimal quantities. The concept is closely associated with the work of mathematicians like Abraham Robinson, who developed non-standard analysis in the 1960s.