Title: Theory / Unimportant / CS / Descriptive / Wikipedia / MoS / Mathematics

Question: Hardest part of writing a mathematical article
Answer: difficulty of addressing the level of mathematical knowledge on the part of the reader
Page: https://en.wikipedia.org/wiki/Wikipedia:Manual_of_Style/Mathematics
Context: wikipedia

Question: Lead should
Answer: contains article title and alternative name in bold in first sentence
Page: https://en.wikipedia.org/wiki/Wikipedia:Manual_of_Style
Context: wikipedia MoS math
Answer2: avoid specialized terminology
Answer3: state that it is about math, or about a domain related to math (geometry, algebra...)
Answer4: contains Historical motivation, including names and dates, especially if the article does not have a separate History section. Explain the origin of the name if it is not self-evident.
Answer5: contains an informal introduction to the topic, without rigor, suitable for a general audience. (The appropriate audience for the overview will vary by article, but it should be as basic as reasonable.) The informal introduction should clearly state that it is informal, and that it is only stated to introduce the formal and correct approach. If a physical or geometric analogy or diagram will help, use one: many of the readers may be non-mathematical scientists.
Answer6: Contains Motivation or applications, which can illuminate the use of the mathematical idea and its connections to other areas of mathematics.