Actually it's C={x:x < 9}, does that mean x is lesser than 9 ? Thanks
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Originally Posted by FailInMaths Actually it's C={x:x < 9}, does that mean x is lesser than 9 ? Thanks Yes, you're right. $\displaystyle C=\{x:x<9\}$ is the set theoretic way of saying the interval $\displaystyle (-\infty,9)$.
Originally Posted by Chris L T521 Yes, you're right. $\displaystyle C=\{x:x<9\}$ is the set theoretic way of saying the interval $\displaystyle (-\infty,9)$. Thanks !