Squashed 'algebra/' changes from 6ee1fe6..f2bc0d5

f2bc0d5 moved all images

git-subtree-dir: algebra
git-subtree-split: f2bc0d50a613fba997c967a17180804b153f9df7
Merge commit '13291ad9213334d5d8185e98aa7341c8edf61a49'
added images