 But if a certain mathematical construction can be constructed out of another one, this is a purely mathematical fact, and as such independent of logic. Logic therefore is descriptive but not creative: by the use of logic, one will never obtain mathematical truths that are not obtainable by a direct mathematical construction (Brouwer 1949C: 1243). Hence, in the development of intuitionistic mathematics, logic can never play an essential role. It follows from Brouwer’s view that logic is subordinate to mathematics. The classical view that mathematics is subordinate to logic is closely related to the view that pure logic has no particular subject matter or domain, and is prior to all. From that perspective, Brouwer’s conception of logic as dependent on mathematics will seem too restrictive. But for Brouwer logic always presupposes mathematics, because in his view it is, like any exact thought, an application of mathematics.