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Real-valued function of a real variable

function whose domain and range are a subset of the real numbers

Pronunciation
/ˈriəl - ˈvæljud ˈfəŋkʃən əv ə ˈriəl ˈvɛriəbəl/
/reɪˈɑːl - ˈvaljuːd ˈfʌŋkʃən əv eɪ reɪˈɑːl ˈvɛːrɪəbəl/