Ebooks/Tutorial on Discrete Mathematics :-
Open Problems in Discrete Mathematics Link
Truth Tables for Digital Logic Link
Sets and Relations Link
Divisibility and the Euclidean Algorithm Link
Induction and Recursion Link
The Pigeon Hole Principle Link
Eric Weisstein's world of mathematics Link
Discrete Mathematics Link
Discrete Mathematics and Applications Link
The Four Color Theorem Link
The Stony Brook Algorithm Repository Link
Definitions from Discrete Mathematics Link
Princeton Discrete Mathematics Seminar Link
Discrete math tutorials, lessons and instructions Link
Discrete Mathematics Link
Discrete Maths Notes Link
Maths Is Fun Link
Discrete Mathematics Link
Logic and Discrete Maths Link
Discrete mathematics in ASCII Link