Major subject areas are branches of knowledge that have a specific focus and cover multiple topics or sub-areas. For example, mathematics is a major subject area because this focuses on understanding the world through numbers and logical relationships, which means it has a specific focus; also, this covers sub-areas such as geometry, trigonometry, or calculus. According to this, formulas and vocabulary are not major areas because they are not branches of knowledge but specific sub-areas or topic. Indeed, vocabulary is a topic in linguistics and related fields, while formulas are a topic in mathematics.
