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174

Centuries: 1st century - 2nd century - 3rd century

Decades: 120s 130s 140s 150s 160s - 170s - 180s 190s 200s 210s 220s

Years: 169 170 171 172 173 - 174 - 175 176 177 178 179

Events

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Pope Soter

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Quadratic formula

... of any field whose characteristic is not 2. (In a field of characteristic 2, the element 2a is zero and it is impossible to divide by it.) The symbol <math>\pm ...