Vectorized hielement.png.
Vectorized k2.png.
Vectorized k22.png.
Merge branch 'master' of git://github.com/xHellerx/Math-tutorial
Merge branch 'master' of git://github.com/xHellerx/Math-tutorial
Update logic-predicates.tex
Merge pull request #11 from m1kc/master

Improvements