Exercise 7, § 4

Tag 03IH, permanent. Cite it as [Bourbaki, Tag 03IH].

Theory of Sets, II, 126

Let G, H, K be three graphs. Prove the relation

(\mathrm{H} \circ \mathrm{G}) \cap \mathrm{K} \subset (\mathrm{H} \cap (\mathrm{K} \circ \overset{-1}{\mathrm{G}})) \circ (\mathrm{G} \cap (\overset{-1}{\mathrm{H}} \circ \mathrm{K})).

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