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## springer-free-maths-books.md

      
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                Olathe
                / springer-free-maths-books.md
            
            
              Created
              December 29, 2015 05:39
                — forked from bishboria/springer-free-maths-books.md
            
              
                Springer have made a bunch of maths books available for free, here are the direct links
              
          
    Direct links to free Springer books (pdf versions)

Graduate texts in mathematics

duplicates = multiple editions
A Classical Introduction to Modern Number Theory,Kenneth IrelandMichael Rosen
A Classical Introduction to Modern Number Theory,Kenneth IrelandMichael Rosen

  
## IntegerSquareRoot.java
/* Sometimes, taking the floored square root of a 64-bit integer is needed.
   In order to gain the speed of hardware square root, 64-bit integers must be converted
     to 53-bit mantissa doubles.
   This can cause incorrect results due to loss of precision.
   However, the floor of the square root produced will be either the correct
     floored square root or the next higher integer.
     For reasoning, see http://apps.topcoder.com/forums/?module=Thread&threadID=695233
   So, we can simply:
     1) Convert to double.
     2) Use hardware square root.

## Optimizing PNGs.md

      
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                Olathe
                / Optimizing PNGs.md
            
            
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              December 19, 2015 00:49
            
              
                Procedure for optimizing PNGs
              
          
pngcheck can detect non-PNGs:
find -name '*.png' -exec pngcheck -q '{}' +
GIMP GUI (unlike *Magick or Script-Fu, which are buggy) can properly convert to sRGB (remember to overwrite the original for each one):


Open in GIMP (press Ctrl-C once it stops opening windows for a while):
find -name '*.png' -exec sh -c "pngcheck -v '{}' | grep -q 'chunk iCCP' && echo \"\\\"{}\\\"\"" \; | xargs gimp & while true; do window_id=$(wmctrl -l | grep -Pom 1 "^(0x[0-9a-f]{8})(?=\s.+ Convert to RGB working space\?$)"); if [ "$window_id" != "" ]; then xsendkey -window $window_id "Alt+C"; fi; sleep 1; done

Convert and overwrite originals:
`wmctrl -l | grep -Po "^(0x[0-9a-f]{8})(?=\s.+ GIMP$)" | while read window_id; do echo Handling window $window_id; xsendkey -window $window_id Alt+i; xsendkey -window $window_id m; xsendkey -window $window_id c; until (wmctrl -l | grep -Poq "^(0x[0-9a-f]{8})(?=\s.+ Convert to ICC Color Profile$)"); do sleep 1; done; wmctrl -l | grep -Po "^(0x[0-9a-f]{8})(?=\s.+


## make-compress-script.rb
#!/usr/bin/env ruby
require 'open3'
require 'tempfile'

ThreadCount = 2

Infinity  = 1.0/0.0
Filenames = Dir['**/favicon.ico', '**/*.png'].map! { |filename| File.expand_path filename }
BestSizes = Hash.new { |h, filename| h[filename] = [Infinity, nil] }
	/* Sometimes, taking the floored square root of a 64-bit integer is needed.
	In order to gain the speed of hardware square root, 64-bit integers must be converted
	to 53-bit mantissa doubles.
	This can cause incorrect results due to loss of precision.
	However, the floor of the square root produced will be either the correct
	floored square root or the next higher integer.
	For reasoning, see http://apps.topcoder.com/forums/?module=Thread&threadID=695233
	So, we can simply:
	1) Convert to double.
	2) Use hardware square root.
	#!/usr/bin/env ruby
	require 'open3'
	require 'tempfile'

	ThreadCount = 2

	Infinity = 1.0/0.0
	Filenames = Dir['/favicon.ico', '/*.png'].map! { \|filename\| File.expand_path filename }
	BestSizes = Hash.new { \|h, filename\| h[filename] = [Infinity, nil] }