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Record 1 1987-01-01

English

Subject field(s)
  • Differential and Integral Calculus
CONT

... an arc of a curve y=f(x) is called concave upward if, at each of its points, the arc lies above the tangent at the point ... and f"(x)>0. (Source: Ayres, Calculus, p. 43).

French

Domaine(s)
  • Calcul différentiel et intégral
CONT

[...] f"(x)>0, elle est donc convexe. [...] Si f admet une dérivée seconde positive sur (a, b), elle est convexe [...] (Source : le Sieur et Lefebvre, Mathématiques, Collection U, Armand Colin, t. 2 (1967), p. 67).

Spanish

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