Centuries: 11th century - 12th century - 13th century
Decades: 1120s 1130s 1140s 1150s 1160s - 1170s - 1180s 1190s 1200s 1210s 1220s
Years: 1166 1167 1168 1169 1170 - 1171 - 1172 1173 1174 1175 1176
... derivatives are represented as ∂/∂x (where ∂ is a rounded 'd' known as the 'partial derivative symbol'). Mathematicians tend to speak the partial ...
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