Q: What is the possible number of reflexive relations on a set of 5 elements?

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The number is 5! = 120

true

Yes. Just pick any number for x and any number for y and you will see. * * * * * This is the reflexive property of "equality"

The number of subjects will depend on what the elements of the set are. The number of subsets is 2a.

An inequality is not a reflexive relationship.

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the total no of reflexive relation on an n- element set is 2^(n^2-n).

The number is 5! = 120

make a table as I did below for the set {a,b,c} with 3 elements. A table with all n elements will represent all the possible relations on that set of n elements. We can use the table to find all types of relations, transitive, symmetric etc. | a | b | c | --+---+---+---+ a | * | | | b | | * | | c | | | * | The total number of relations is 2^(n^2) because for each a or b we can include or not include it so there are 2 possibilities and there are n^2 elements so 2^(n^2) total relations. A relation is reflexive if contains all pairs of the form {x,x) for any x in the set. So this is the diagonal of your box. THESE ARE FIXED! No, in reflexive relation we still can decide to include or not include any of the other elements. So we have n diagonal elements that are fixed and we subtract that from n^2 so we have 2^(n^2-n) If you do the same thing for symmetric relations you will get 2^(n(n+1)/2). We get this by picking all the squares on the diagonal and all the ones above it too.

It tells you the atomic number, the number of protons, the density, its relations to other elements, and its characteristics.

2^(n^2+n)/2 is the number of symmetric relations on a set of n elements.

90 naturally occurring elements, unknown number possible elements.

The reflexive property simply says that A=A, in other words, any number is equal to itself.

no that's not possible

true

It is possible only because of different number of neutrons.

The reflexive property of mathematics states that a=a, or that any number is always equaled to itself.Examples:1 = 15 = 5-10² = -10²

Reflexive property of equality.