Example 4
Tag 08C1, permanent. Cite it as [Bourbaki, Tag 08C1].
Functions of a Real Variable, chapter IV, § 1. EXISTENCE THEOREMS
For the scalar equation one has and the right-hand side is bounded on , so (IV, p. 173, cor. 1) every integral is defined on all of .
Bourbaki puts the proof directly after the statement, so what is above is the statement and its proof together.