Decades: 220s BC 210s BC 200s BC 190s BC 180s BC - 170s BC - 160s BC 150s BC140s BC 130s BC 120s BC
Years: 175 BC 174 BC 173 BC 172 BC 171 BC - 170 BC - 169 BC 168 BC 167 BC 166 BC 165 BC
... to an earlier, simpler, state"
In mathematics, a limiting case in which a class of object changes its nature so as to belong to another, usually simpler, class. ...
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