diff --git a/01.curriculum/01.physics-chemistry-biology/04.Niv4/03.geometrical-optics/05.matrix_paraxiale_optics /default.fr.md b/05.matrix_paraxiale_optics/default.fr.md
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rename from 01.curriculum/01.physics-chemistry-biology/04.Niv4/03.geometrical-optics/05.matrix_paraxiale_optics /default.fr.md
rename to 05.matrix_paraxiale_optics/default.fr.md