4
4 is a number, numeral, and digit. It is the natural number following 3 and preceding 5. It is the smallest composite number, its proper divisors being 1 and 2.
Mathematics[edit]
In mathematics, the number 4 is significant in various ways:
- It is the smallest composite number.
- It is the smallest square number (2^2).
- It is the only number with the same number of letters as its value in the English language.
- It is the second Fermat prime.
- It is the second square number.
Properties[edit]
- 4 is the smallest number of sides of a polygon (a quadrilateral).
- It is the smallest number of vertices of a polyhedron (a tetrahedron).
- It is the smallest number of dimensions of a hypercube.
Science[edit]
In science, the number 4 has various applications:
- There are four fundamental forces in physics: gravitational force, electromagnetic force, strong nuclear force, and weak nuclear force.
- There are four nucleotide bases in DNA: adenine, cytosine, guanine, and thymine.
Culture[edit]
In various cultures, the number 4 holds different significances:
- In Chinese culture, the number 4 is considered unlucky because it sounds like the word for "death" (死, pinyin: sǐ).
- In Western culture, the number 4 is often associated with stability and order, as seen in the four seasons, four cardinal directions, and four elements (earth, water, air, fire).
Religion[edit]
- In Christianity, there are four Gospels: Matthew, Mark, Luke, and John.
- In Hinduism, there are four Vedas: Rigveda, Samaveda, Yajurveda, and Atharvaveda.
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Categories[edit]
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