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On mathematical structure in a broad sense (Japanese)

2020
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Zenodo
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For example, a ring is a structure of the language $\{+,-,\times,0,1\}$, and a ring is not a structure of the language $\{+,-,\times,\cdot^{-1},0,1\}$ because the domain of the operation $\cdot^{-1}$ of the multiplicative inverse is not the whole. In general, it is not officially possible to introduce a function symbol into a partial function. In this paper, we consider "a structure in a broad sense" that allows a partial function as the interpretation of a function symbol, we give its

doi:10.5281/zenodo.4049420
fatcat:rmdcbefqb5gttal4xurpexhx4y