1) tacit admission
A lot of people are familiar with the rule of admission in the civil law procedure, but they usually pay little attention to tacit admission.
In practice of justice, it is very common that one party do not refute the adverse facts held in lawsuit by the adversary which be called tacit admission in theory.
2) The Primary Study of Tacit Admission
3) implied recognition
4) implied consent
5) primary assumption of risk
6) implied assumption of risk