For good bookshelves to browse check out the following links:
- American Institute of Mathematics: Approved Textbooks
- Project Gutenberg: Mathematics Bookshelf
- A First Book in Algebra by Wallace C. Boyden
- Book of Proof by Richard Hammack
some numbers
n | 0 | 1 | 2 | 3 | n |
l | 1 or |
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x | 0 | 1 | ?? | ||
y | 0 | 0 | ?? |