factor

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factor,

in arithmetic, any number that divides a given number evenly, i.e., without any remainder. The factors of 12 are 1, 2, 3, 4, 6, and 12. Similarly in algebra, any one of the algebraic expressions multiplied by another to form a product is a factor of that product, e.g., a+b and ab are factors of a2b 2, since (a+b)(ab)=a2b2. In general, if r is a rootroot,
in mathematics, number or quantity r for which an equation f(r)=0 holds true, where f is some function. If f is a polynomial, r is called a root of f; for example, r=3 and r
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 of a polynomialpolynomial,
mathematical expression which is a finite sum, each term being a constant times a product of one or more variables raised to powers. With only one variable the general form of a polynomial is a0xn+a1x
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 equation f(x)=0, then (xr) is a factor of the polynomial f(x).

factor

[′fak·tər]
(mathematics)
For an integer n, any integer which gives n when multiplied by another integer.
For a polynomial p, any polynomial which gives p when multiplied by another polynomial.
For a graph G, a spanning subgraph of G with at least one edge.
(statistics)
A quantity or a variable being studied in an experiment as a possible cause of variation.

factor

1. Maths
a. one of two or more integers or polynomials whose product is a given integer or polynomial
b. an integer or polynomial that can be exactly divided into another integer or polynomial
2. Med any of several substances that participate in the clotting of blood
3. Law, Commerce a person who acts on another's behalf, esp one who transacts business for another
4. former name for a gene
5. Commercial law a person to whom goods are consigned for sale and who is paid a factorage
6. (in Scotland) the manager of an estate

factor

A quantity which is multiplied by another quantity.

See also divisor.

factor

A number that divides evenly into another number. For example, 3 and 4 are factors of 12. See factorial and IFP.
References in periodicals archive ?
Kale, Formulation and in vitro evaluation for sun protection factor of Moringa oleifera lam (family-moringaceae) oil sunscreen cream, Int J Pharm Pharm Sci., 03, 371 (2011).
The sunscreens must offer broad-spectrum (UVA/UVB) protection and a sun protection factor of 15 or higher.
Lycopene in foods and supplements can never replace an SPF 15+ sunscreen but seems to enhance a sunscreens effect by providing a sun protection factor of between two and four--from the inside.
* Cover exposed skin with a waterproof, broad spectrum (UVA and UVB) sunscreen with a sun protection factor (SPF) of at least 15.
The sunscreen container should have a sun protection factor (SPF) rating of 15 or above and should state that it provides broad-spectrum (UVA and UVB) protection.
* Waterproof sunscreens with an SPF (Sun Protection Factor) of fifteen or higher that protect against UVA (ultraviolet alpha) and UVB (ultraviolet beta) rays work best.
The sun protection factor number required on the label of sunscreens refers to UV-B.
* Use a waterproof sunscreen with an SPF (sun protection factor) of 15 or higher that protects against both UVA and UVB rays.
Its literature recommends wearing tightly woven clothing, such as a long-sleeved shirt and pants, and using a sunscreen with a sun protection factor of at least 15.
In the last issue of Medical Update, we dealt with the relationship of body moles (or nevi) to skin cancer, ending with a recommendation to use sunscreens with a sun protection factor (SPF) of at least 15.
A cotton-and-polyester T-shirt according to one recent study, has an SPF (sun protection factor) of 12 to 20--as high as most sunscreens.
Results showed that sunscreen with a sun protection factor (SPF) of 50, applied in a typical way, would at best provide 40% of the expected protection.