► downloadable teaching materials for Calculus HL optionIn the previous Maths HL syllabus this HL option topic was entitled Infinite Series and Differential Calculus - and this title is still a reasonable description, especially if you add the word "Calculus". So, although this HL option is now called simply "Calculus", I think that it would be better described as "Differential Equations, Infinite Series & Calculus"...