Unit 2: Building on the Basics

**Only If, and Necessary and Sufficient Conditions**

__Videos__

__Exercises:__

2.1 Symbolizing Only if and Necessary and Sufficient Conditions (Symbolize)

2.1b Logical Synonym Review (Speed)

**Proofs Using**→

**in**

__Videos__

__Exercises:__

None at this time

**Symbolizing Negations (~)**

__Videos__

__Exercises:__

2.6 Symbolizing Negations (Symbolize)

2.6b Main Connectives Again (Multiple Choice)

2.7 Complex Negations (Multiple Choice)

**Proofs Using ~out and ~in**

__Videos__

__Exercises:__

None at this time

**Proofs Using Advanced Strategies**

__Videos__

__Exercises:__

None at this time

Note: The red cubes are for the benefit of my Saturday "hybrid" classes. They indicate

__required__videos. Their content is not necessarily more important, but they include things which we may not cover in the classroom.