Bourbaki

Example 1

Tag 02J3, permanent. Cite it as [Bourbaki, Tag 02J3].

Théories spectrales, chapter II, § 1. Transformation de Fourier

Let f:H→f: H\rightarrow G be a strict injective morphism whose image is a distinguished subgroup. The sequence

1→H⟶fG⟶pG/f(H)→1 1\rightarrow H\overset{f}{\longrightarrow}G\overset{p}{\longrightarrow}G/f(H)\rightarrow 1

where pp is the canonical projection, is exact. In particular, if H is a closed distinguished subgroup of G, the sequence of topological groups

1→H⟶jG⟶pG/H→1 1\rightarrow H\overset{j}{\longrightarrow}G\overset{p}{\longrightarrow}G/H\rightarrow 1

where jj is the inclusion and pp the canonical projection, is exact.

Bourbaki sets the proof directly after the statement, and the corpus does not separate them, so what is above is the statement and its proof together.

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Machine translation of the English, by gpt-5.4, gpt-5-6-mini, against glossary version 34. Not checked by a person. That model is a cut down version of the one the rest of this language was written by.