|Is, philosophy: the word “is” has different functions like expressing an identity e.g. A is B, attributing a property e.g. the sky is blue or being contained in a set e.g. "Heaven" is a concept. These functions must not be confused.|
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Is/Tugendhat: triple meaning of being (already Plato, Sophist): 1. existence, 2. predication 3. Identity.
Is/Heidegger/Tugendhat: "The sky is blue" (Example from Heidegger) - to which being refers "is"? to the sky or to what is meant by "blue" - therefore one should omit the orientation on the beings.
Vorlesungen zur Einführung in die Sprachanalytische Philosophie Frankfurt 1976
Philosophische Aufsätze Frankfurt 1992