Boson operators and Boson inverse operators

Contraction Shift Strategy

∑-generalized contradiction

△-analytic continuation

△-contraction

△-contraction graph

1 planar contraction flow

1-set contraction

1-set contraction mapping

4 planar contraction flow

4∶1 planar contraction

a bone of contention

A group contribution model

abnormal uterine contraction

abrupt contraction

academic contribution

accelerated contamination

access contention

accident contamination