Discussion about math, puzzles, games and fun. Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫ • π ƒ -¹ ² ³ °
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ADS Digital Library
ADS* Digital Library is a collection of books(some pdf-files, some images, and there might be clean texts) brought to you by NASA(but stored at Harvard servers) on the topics of astronomy and astrophysics. It's not a giant collection(16 books) but some might be on your field of interrest. Just thought I'd share.
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