• Irrational N.
• Real N.
• Operations
• Powers
• Intervals
• Half-line
• Absolute value
• I

A number is irrational if there are infinite decimal places non-recurrent, therefore it cannot be expressed in the form of fraction.

The best known irrational number is , which is defined as the relationship between the perimeter of the circle and its diameter.

= 3.141592653589...

Other irrational numbers are:

The number e appears in growth processes, in radioactive decay and in the formula of the catenary, which is the curve that is found in power lines.

e = 2.718281828459...

The golden ratio, , used by artists from all periods (Phidias, Leonardo da Vinci, Alberto Dürer, Dalí,..) in the proportions of their works.

•  
• 
•