Can you tell me what this math terminology means?

What search terms could I use to find out more about this. How could I use e.g. a₁ in an equation. 

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  • 1 month ago
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    In set theory, symbol → denotes a function.

    f: X → Y means the function f maps the set X into the set Y.

    For example, phrasing

    Let f:R→R with f(x)=x²

    is used to tell that f(x)=x² has set od real numbers R both as domain and codomain, that is, both argument and the result are real numbers.

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