Quote: principles of structuring -- transparency of meaning and purpose, recursive application, narrow interface, manifestness of structure

Quotation Skeleton

why is the notation of arithmetic expressions of … the principles of structuring, which underlie all our … subproblems, with clean and narrow interfaces between them. … or complex arithmetic expressions. @ The meaning of … E and F; @the purpose of each part … parts can be understood wholly independently of each … [E and F may be understood in the same way;] @the interface between the parts is clear, narrow, and well … their relation to the whole is clearly apparent … and purpose; independence of parts; recursive application; narrow …   Google-1   Google-2

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Additional Titles

Quote: understand X+Y by recursively understanding each part independently; manifest structure, clear meaning and purpose

Quote: the interface between the parts of X+Y is a single number

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