Why is the inverse image of the open set {t|t<1/2},(adsbygoogle = window.adsbygoogle || []).push({});

{t|t>=1/2 or t<1/4}?

the t>+1/2 sort of makes sense to me, but can't seem to grasp how t<1/4 is an inverse image

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# Inverse Image of an Open Set

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