Aha! Solutions (MAA Problem Book Series) by Martin J. Erickson
The M___emat__al As__c__ti_n of Am__ica | English | 2008 | ISBN: 0883858290 | 220 pages | PDF | 14.0 MB

Every mathematician (beginner, amateur, and professional alike) thrills to find simple, elegant solutions to seemingly difficult problems. Such happy resolutions are called ''aha! solutions,'' a phrase popularized by mathematics and science writer Martin Gardner. Aha! solutions are surprising, stunning, and scintillating: they reveal the beauty of mathematics.

Challenging Problems in Geometry (Dover Books on Mathematics) by Alfred S. Posamentier and Charles T. Salkind
D_v_r P__li__t__ns | English | 1996 | ISBN: 0486691543 | 256 pages | PDF | 6.36 MB

Stimulating collection of unusual problems dealing with congruence and parallelism, the Pythagorean theorem, circles, area relationships, Ptolemy and the cyclic quadrilateral, collinearity and concurrency, and many other topics. Challenges are arranged in order of difficulty and detailed solutions are included for all. An invaluable supplement to a basic geometry textbook.

[Video2brain] Practical workshops Lightroom 4 | ISO | 3.2 GB Genre: Video Training More than 20 working solutions and many tips for professionals. "In Lightroom you can sort and view your photos." This and similar phrases we hear again and again. But that's not all - in Lightroom can do much more. In these video lessons Michael Mueller will show you things Lightroom are made in and that perhaps you have not seen yet. This course includes a complete workflow for retouching wedding photos the development in landscape or night scene as well as many stunts and spectacular effects!

International Mathematical Olympiads 1959-2000
A___em_c D__t__bu__on C__t_r | English | 2001 | ISBN: 0964095912 | 190 double pages | PDF, DJVU | 29.3, 2.92 MB

Problems, solutions, and results from the International Mathematical Olympiads held from 1959 through 2000.

Shape - May 2012 English | PDF | 174 pages | 68.4 Mb