move special operators into contractions.py for now

3 jobs for symbolicDifferentiation in 1 minute and 36 seconds (queued for 1 second)
Status Job ID Name Coverage
  Build Docker
passed #567992
build_docker_from_cache

00:00:20

 
  Test
passed #567993
test_python2_with_coverage

00:01:16

81.0%
passed #567994
test_python3

00:01:08