Supérieur à, inférieur à (irregular comparatives)

Look at these comparisons:

L'huile d'olive est supérieure à l'huile de maïs.Olive oil is superior to corn oil.

Ce produit est inférieur au nôtre.This product is inferior to ours.

Mes notes sont inférieures aux notes de Martin.My grades are inferior to Martin's grades.

La glace à la vanille est supérieure à la glace au chocolat.Vanilla ice cream is superior to chocolate ice cream.

Note that the following adjectives are naturally comparative:

supérieur/e   à (superior to)

inférieur/e   à (inferior to)

Therefore, they have no comparative or superlative form; you never say plus inférieur que or moins supérieur que.
They agree in gender and number with the noun they refer to.
Note also that they are followed by the preposition à rather than que

Note that the preposition à will become au or aux when followed by articles le or les.

See À + le = au, à + les = aux, de + le = du, de + les = des (contractions of articles) 

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Examples and resources

La glace à la vanille est supérieure à la glace au chocolat.Vanilla ice cream is superior to chocolate ice cream.
Mes notes sont inférieures aux notes de Martin.My grades are inferior to Martin's grades.
L'huile d'olive est supérieure à l'huile de maïs.Olive oil is superior to corn oil.
Ce produit est inférieur au nôtre.This product is inferior to ours.
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