The term "strict" can refer to different concepts depending on the context in which it is used. Here are a few possible interpretations: 1. **General Definition**: In everyday language, "strict" typically refers to someone or something that is firm and demanding in terms of rules or standards. For example, a strict teacher may have high expectations for student behavior and performance.

A lemma is a statement or proposition that is proven for the purpose of helping to prove a larger theorem or result. In mathematics and logic, lemmas are intermediate steps that aid in establishing the validity of other statements. They are often used to break down complex proofs into more manageable parts, making the overall argument clearer and easier to follow. In linguistics, "lemmas" refer to the canonical or base form of a word, which represents all its inflected forms.

Computer algebra, also known as symbolic computation or algebraic computation, refers to the study and development of algorithms and software that perform algebraic manipulations in a symbolic rather than numeric form. This field allows for the manipulation of mathematical expressions, solving equations, and performing other algebraic tasks using symbols rather than numerical approximations.

Series expansions are mathematical representations of functions as infinite sums of terms, where each term is calculated from the function's derivatives at a specific point. These expansions allow functions to be approximated or expressed in a more convenient form for analysis, computation, or theoretical work. There are several types of series expansions, but the most common ones include: 1. **Taylor Series**: This representation expands a function \( f(x) \) around a point \( a \) using derivatives at that point.