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231

Centuries: 2nd century - 3rd century - 4th century

Decades: 180s 190s 200s 210s 220s - 230s - 240s 250s 260s 270s 280s

Years: 226 227 228 229 230 - 231 - 232 233 234 235 236

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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 symbo ...