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What are field axioms?

Updated: 4/28/2022
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Raice03

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13y ago

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Field Axioms are assumed truths regarding a collection of items in a field.

Let a, b, c be elements of a field F. Then:

Commutativity:

a+b=b+a and a*b=b*a

Associativity:

(a+b)+c=a+(b+c) and (a*b)*c = a*(b*c)

Distributivity:

a*(b+c)=a*b+b*c

Existence of Neutral Elements:

There exists a zero element 0 and identify element i, such that,

a+0=a

a*i=a

Existence of Inverses:

There is an element -a such that,

a+(-a)=0

for each a unequal to the zero element, there exists an a' such that

a*a'=1

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An Axiom is a mathematical statement that is assumed to be true. There are five basic axioms of algebra. The axioms are the reflexive axiom, symmetric axiom, transitive axiom, additive axiom and multiplicative axiom.


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Why does the fact 0 has no multiplicative inverse still mean R is still a field?

In the definition of a field it is only required of the non-zero numbers to have a multiplicative inverse. If we want 0 to have a multiplicative inverse, and still keep the other axioms we see (for example by the easy to prove result that a*0 = 0 for all a) that 0 = 1, now if that does not contradict the axioms defining a field (some definitions allows 0 = 1), then we still get for any number x in the field that x = 1*x = 0*x = 0, so we would get a very boring field consisting of only one element.