'Sentence letters' presentation slideshows

Truth-Tables

Truth-Tables. Recap. Deductive Validity. We say that an argument is deductively valid when it has the following property: If the premises of the argument are true, then the conclusion of the argument must be true.

975 views • 86 slides

Probability Theory

Probability Theory. Validity. A bar is obeying the law when it has the following property: If any of the patrons are below the age of 18, then that person is not drinking alcohol. Legal or Illegal?. Ignore People over 18. Make Sure No One Else Has Alcohol. Illegal !. Legal or Illegal?.

1.01k views • 83 slides

Natural Deduction

971 views • 74 slides

Formal Test for Validity

Formal Test for Validity. evaluations. Evaluations. An evaluation is an assignment of truth-values to sentence letters. For example: A = T B = T C = F D = T E = F. Evaluating WFFs. To evaluate a WFF is to determine whether it is true or false according to an evaluation.

616 views • 53 slides