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Document integrity: “Practical Application of Cryptographic Checksums”, with an introduction to applied cryptography.

Scientific typesetting: “Free Typesetting Software for the Professional Document Preparation”

Software equipment: “Introduction to Free Software and Operating Systems”

News Ticker:: Introduction to RSS

Introduction to the indirect proof: “Proof of the Irrationality of the Square Root of 2”

Mathematical proofs are used to prove the cor­rect­ness of formulas and assumed facts. Sev­er­al basic procedures and ways of veri­fy­ing mathematical correctness are in use, all of which follow a fixed scheme.

For the proof of the irrationality of the square root of 2 dif­fer­ent proofs exist. This article explains the indirect proof vari­ant in detail and introduces one of the possible short spell­ings in mathematical notation. Exercises with solutions con­soli­date what has been learned. 12 pages::

      A4  •  A4 duplex  •  US-Letter  •  US-Letter duplex

School mathematics: Detailed so­lu­tions to the first 27 text problems of “A first book in Al­­ge­­bra”, author Wallace C. Boyden, added, a textbook for be­gin­ners in algebra: Text problems with solutions, 10 pages (PDF, A4 format, in English)..

Freiburg i.Br.: “Freiburg Excursion Destinations and Film Recommendations”

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