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ITEC 122
2008fall
ibarland

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lect07a
functions

Consider the function swirl: img -> img,
as well as the function pixellate: img -> img.
Are these 1-1? onto? invertable?


   ---- 
   Sums:
     Sum_{i=1..5} i^3
     Sum_{i=1..5} 2i
     Sum_{i=1..5} (2i+3)

     Sum_{i=1..n} i  (Gauss; geometric)  Memorize this one!
     Sum_{i=1..100} 5i
     Sum_{i=1..100} (i+3)

     Sum_{i=1..n} 2^i   Memorize this one!

   More examples, worked out: summations.pdf
     



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©2008, Ian Barland, Radford University
Last modified 2008.Oct.13 (Mon)
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