Problem: Add spaces: InAperçuhistoriqueChaslesstudiedthemethodofreciprocalpolarsasanapplicationoftheprincipleofdualityinprojectivegeometry;inthesamewaytheprincipleofhomographyleadstoagreatnumberofpropertiesofquadricsurfaces.

Spaces added: In Aperçu historique Chasles studied the method of reciprocal polars as an application of the principle of duality in projective geometry ; in the same way the principle of homography leads to a great number of properties of quadric surfaces .

Problem: Add spaces: RecommendedRetailPrice6,90€

Spaces added: Recommended Retail Price 6,90 €

Problem: Add spaces: Afterawhileitwasover,andtheystartedtodressagain.

Spaces added: After a while it was over, and they started to dress again.

Problem: Add spaces: Read“TheSocialPersonality.”

Spaces added:
Read “The Social Personality.”