add background
Merge branch 'master' of https://github.com/larskotthoff/recomputation-ss-paper
Some thoughts for obstacles.
Merge branch 'master' of github.com:larskotthoff/recomputation-ss-paper
Merge pull request #5 from rumapaul/master

Report of Group 2
updated mappings
Merge branch 'master' of https://github.com/larskotthoff/recomputation-ss-paper
Merge remote-tracking branch 'upstream/master'
Paper started

Added opening paragraph and structure.
Merge remote-tracking branch 'upstream/master'