## Help with Replacement or Rewrite Rules

## Replacement or Rewrite Rules

6/21/07

Rewrite Rules

Topic

Logical System

6/21/07

Rewrite Rules

Another Example of a Harder Sentential Proof: One of De Morgan's Laws
admin
Sat, 01/11/2014 - 01:50
## Example of a Harder Propositional Proof: One of De Morgan's Laws

### Example

Topic

Logical System

10/23/06

Example of a Harder Sentential Proof
admin
Sat, 01/11/2014 - 01:50
## Example of a Harder Propositional Proof

### Example

Topic

Logical System

2/27/06

Help with Or Elimination and Bi-conditional Introduction
admin
Sat, 01/11/2014 - 01:50
## Or Elimination and Bi-Conditional Introduction

### Or Elimination

Topic

Logical System

12/23/05

Your browser does not support html5 video.

Topic

Logical System

2/24/06

Topic

Logical System

9/12/06

This video shows the techniques for Conditional Proof using the downloadable application Deriver. But the techniques are exactly the same for the Proof applet running in a web page. So, the video may look slightly different to what you are looking at, but the underlying principles and approach are the same.

Your browser does not support html5 video.

Topic

Logical System

12/22/05

This video is set in the context of the downloadable program, but it applies equally well in the setting of a proof applet.

Topic

Logical System

Topic

Logical System

2013

This movie shows the downloadable application being used, but the manipulations are so similar to those of the web page applet that it really covers both.

Your browser does not support html5 video.

Topic

Logical System

2013

To learn how to use the Universal and Existential Quantifiers in symbolizing propositions.

In Predicate Logic there are two new logical connectives, the* Universal Quantifier* (∀x) and the *Existential Quantifier* (∃x). These are used for symbolizing certain English constructions (they also have their own rules of inference and their own semantics, which we will learn about later).