BOOLEAN ALGEBRA
Foreword
Logic links
Negation (NOT)
Product (AND)
Inverted Product (NAND)
Sum (OR)
Invertd Sum (NOR)
Exclusive sum (XOR)
Logical Functions
Sequential and combinatorial functions

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SEQUENTIAL AND COMBINATORIAL FUNCTIONS

A COMBINATORIAL function is an immediate link between input and output variables
where the previous input variables are irrelevant .

If on the other hand, previous variables are relevant, the function is SEQUENTIAL.

In sequential systems the previous inputs affect the current system status.
Therefore, the sequential system has a memory and the system status is the initial condition of the system evolution.