Synthesized answer
The provided passages do not contain information about the evidence the author provides in the book "LaTeX: A Document Preparation System" [Passage 1]. The passages only offer the title of the book, the author's name, and its description and categories related to computing methodologies and text processing [Passage 1].
Therefore, I cannot answer the question about the author's evidence based on the given text.
Synthesized from the book passages below. Chat with the book on Feynman for follow-up.
From the book
Title: LATEX by Leslie Lamport Description: Computing Methodologies -- Text Processing. Categories: Computers Pages: 298 Snippet: Computing Methodologies -- Text Processing.