Analysis 好多定理係以 inequalities 形式表達，需要掌握一定 inequalities 技巧。

Set notation喺高中Probability課書有呀，但由於DSE數學卷唔出，一般老師都係求其講下就算。不過Calculus I一開頭應該點都會教返基本set theory同functions (onto, 1-to-1 & inverse functions)掛…？ 砌inequality嘅技術係唔係要去返以前A Level Pure Maths嘅程度？ 我個人覺得高中Maths理應要教埋logics and proofs，即if-then statements, proof by contrapositive, disprove by counter example, proof by contradiction, etc 其實依堆嘢喺Circle Geometry都會用到呀，但就係唔教