finite union of closed sets is closed

Determine whether the set of irrational numbers is closed under multiplication. => Yes or No..

Determine whether the set of negative integers is closed under addition. => Yes or No..

The damaged platelets release a substance called thromboplastin. This sets in action, a series of reactions that result in the formation of clot..

Summary - A well-defined collection of definite objects is called a set. In roster method of representing a set, all the elements are listed in the set. In property method of representing a set, all the elements are represented by stating all the properties which are s..

Let us examine closely the following sets of compounds and study their properties in terms of their physical state, melting points and boiling poin..

Let us examine closely the following sets of compounds and study their properties in terms of their physical state, melting points and boiling point..

In conjoint bundle xylem and phloem occur in the same bundle along the same radius. The conjoint bundle is of two types: Collateral where, the vascular bundle consists of only one set of xylem and one set of phloem. The collateral bundle can be either open or closed...

We say that because both left hand limit and right hand limit are finite and equal. If there exists a real number l such that if |f (x) - l| can be made as small as we possible by taking x sufficiently close to a, then l is called the limit of f (x) as x tends to 'a'...

It is a common observation that most of the reactions when carried out in closed vessels do not go to completion, under a given set of conditions of temperature and pressure. Infact in all such cases, in the initial state, only the reactants are present but as the reaction..

When a chemical reaction gets started the reactants are present in the initial stage, but as the reaction proceeds, the concentration of the reactants decreases and that of products increases. Finally, a stage is reached when no further change in concentration of reactants and products is observed...