Last Updated ：2025/11/24

substitutivity

Noun

uncountable

(philosophy) A logical relationship in which two terms can be mutually substituted without affecting the truth value of any propositions in which the terms occur, thereby establishing that the terms are identical.

Japanese Meaning

哲学において、2つの項が互いに置き換え可能であり、その置き換えによって含まれる命題の真理値が変わらないという論理関係を示す概念。これにより、2つの項の同一性が確立される性質を意味する。

What is this buttons?

In analytic philosophy seminars, the professor demonstrated how substitutivity can fail in intensional contexts like belief reports.

Google Translation / DeepL Translation

分析哲学のセミナーで、教授は信念報告のような内包的文脈において置換可能性が成り立たないことを示した。

Details

Sense（1）

One of the fundamental principles governing identity is that of substitutivity—or, as it might well be called, that of indiscernibility of identicals. It provides that, given a true statement of identity, one of its two terms may be substituted for the other in any true statement and the result will be true.

Google Translation / DeepL Translation