external binary operation

function f: R × S → S or f: S × R → S

en-US/ɪkˈstɝnəl ˈbaɪnɚi ˌɑpɚˈeɪʃən/
en-GB/ɪkˈstɜːnl baɪnəɹiː ˌɒpəˈɹeɪʃən/

カテゴリ：

law of compositionbinary operationbinary function that is not an internal binary operation