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  2. Ancient Greek verbs - Wikipedia

    en.wikipedia.org/wiki/Ancient_Greek_verbs

    The present stems of three of these verbs δίδωμι (dídōmi), τίθημι (títhēmi) and ἵστημι (hístēmi) are reduplicated as a progressive marker, meaning that the true stems δο-(do-), θε-(the-), and στα-(sta-) were doubled up in the present as δίδω-, τίθη-, and ἵστη-(originally σίστη-) .

  3. Categorical imperative - Wikipedia

    en.wikipedia.org/wiki/Categorical_imperative

    The categorical imperative (German: kategorischer Imperativ) is the central philosophical concept in the deontological moral philosophy of Immanuel Kant.Introduced in Kant's 1785 Groundwork of the Metaphysics of Morals, it is a way of evaluating motivations for action.

  4. Present serviceability index - Wikipedia

    en.wikipedia.org/wiki/Present_Serviceability_Index

    The PSI was developed based on the AASHO Road Test's present serviceability rating (PSR). AASHO Road Test was a set of experiments carried out by the AASHTO from 1956 to 1961. [4] Unlike the PSR, which was a ride quality rating that required a panel of observers to ride in a car over the pavement of interest, the PSI does not require a panel of ...