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corey1234

  • 3 years ago

If it is the GRAPH of a function from A to B that is a subset of A x B, then why do websites say that a function f is a subset of A x B? Such as this website on page 7 of 22 http://www.mathdb.org/notes_download/elementary/algebra/ae_A1.pd

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  1. watchmath
    • 3 years ago
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    well a function is a special relation. If a is related to b by a relation we write it as aRb. But to make it more convinient we just write it as (a,b) to say that aRb.

  2. corey1234
    • 3 years ago
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    So you are saying that a function is already a set of ordered pairs/?

  3. watchmath
    • 3 years ago
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    strictly speaking functions is the rule that relates an ordered pairs. But if we are given the ordered pairs then we know how the rule behave.

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