The conditional is one of the most common types of logical and mathematical propositions. The generic conditional takes the form: "If p is true, then q is true, too." The first part of the conditional (the "if-clause") is known as the antecedent, the...

. A necessary condition for something is one without which the thing does not exist or occur. The presence of oxygen is a necessary condition for human life. A sufficient condition for something is one given which the thing does exist or occur....

That man is not poor who has what is sufficient for all his wants. (Roman) We have what is sufficient, when we have what nature requires....

In logic, the words necessity and sufficiency refer to the implicational relationships between statements. The assertion that one statement is a necessary and sufficient condition of another means that the former statement is true if and only if the...

The spectacular development of information and communication technologies (ICT) through the Internet has provided opportunities for students to explore the virtual world of information. It provides them with the tools to point and click their way around the world, visiting different places, collecting...

Whereas physics has evolved through three conceptual stages, the third being that of field theory, psychology has remained largely at the second stage, that of mechanistic or statistical correlation, and it has retained even some elements of the first stage, that of substance-property. However,...