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                <term xml:lang="en">COMPUTER ARITHMETIC</term>
                <term xml:lang="en">ULP</term>
                <term xml:lang="en">UNIT IN THE LAST PLACE</term>
                <term xml:lang="en">FLOATING-POINT ARITHMETIC</term>
                <term xml:lang="fr">ARITHMETIQUE DES ORDINATEURS</term>
                <term xml:lang="fr">ARITHMETIQUE VIRGULE FLOTTANTE</term>
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              <p>Function ulp (acronym for unit in the last place) is frequently used for expressing errors in floating-point computations. We present several previously suggested definitions of that function, and analyse some of their properties.</p>
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              <p>La fonction  ulp  (acronyme pour unit in the last place, c’est-à-dire “poids du dernier chiffre”) est fréquemment utilisée pour exprimer des erreurs en arithmétique virgule flottante. Nous présentons plusieurs définitions précédemment suggérées pour cette fonction, et analysons quelques unes de leurs propriétés.</p>
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