Classes of intensional definitions Definition

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a genus–differentia definition type of intensional definition takes large category (the genus) , narrows down smaller category distinguishing characteristic (i.e. differentia).


more formally, genus-differentia definition consists of:



for example, consider following genus-differentia definitions:



a triangle: plane figure has 3 straight bounding sides.
a quadrilateral: plane figure has 4 straight bounding sides.

those definitions can expressed genus ( plane figure ) , 2 differentiae ( has 3 straight bounding sides , has 4 straight bounding sides , respectively).


it possible have 2 different genus-differentia definitions describe same term, when term describes overlap of 2 large categories. instance, both of these genus-differentia definitions of square equally acceptable:



a square: rectangle rhombus.
a square: rhombus rectangle.

thus, square member of both genus rectangle , genus rhombus .








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