1. Basic Logical Operations (Fascinating)
In this section you will learn what are the basic logical operations and how to evaluate different logical expressions
Image from Star Trek © Paramount

2. Logical AND Logic gate Truth table X Y X AND Y False True Truth table1
Logic gate

3. Logical AND: An ExampleT F
AND

4. Logical OR Logic gate Truth table X Y X OR Y False True Truth table X1
Logic gate

5. Logical OR: An Example T F OR

6. Logical NOT Logic gate Truth table X Not X False True Truth table X1
Logic gate

7. Logical NOT: An ExampleF
NOT

8. Logical NAND Logic gate Truth table X Y X AND Y X NAND Y False True1
Logic gate

9. Logical NAND: An ExampleT F
AND
NAND

10. Logical NOR Logic gate Truth table X Y X OR Y X NOR Y False True1
Logic gate

11. Logical NOR: An ExampleT F OR
NOR

12. Logical Exclusive OR (XOR)
Truth table X Y
X XOR Y
False
True
Truth table X Y
X XOR Y 1
Logic gate

13. Logical XOR: An ExampleT F
XOR

14. Logic: Greater Than Two InputsX Y Z
X OR Y OR Z ? X Y Z
X AND Y AND Z ?

15. Example Boolean Expressions To Evaluate
True AND True AND False AND True
True OR True OR False OR True
(True OR False) AND (False OR False)
NOT (True OR False)
NOT (True AND True)

16. Reasons For Learning Logic: Hardware
The computer is built using logic circuits

17. A 4 Bit Comparator Circuit

18. Reasons For Learning About Logic: Software
Logic is common-place in computer programs e.g., database searches.

19. Reasons For Learning About Logic: Software (2)

20. Reasons For Learning About Logic: Software (3)

21. You Should Now Know
The different types of logical operations that a computer may perform
AND OR
NOT
NAND
NOR
XOR
How to evaluate complex Boolean expressions formed with combinations of AND, OR, NOT
How logic gates form an important part of computers