What Does \bar{\in} Symbol Mean?

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The symbol \bar{\in} is often used as a substitute for \notin, especially in older manuscripts where the latter could not be printed. It indicates that an element does not belong to a set. Users are encouraged to provide context or formulas to clarify its meaning, as the stand-alone symbol can be ambiguous. The discussion highlights the evolution of notation in mathematical texts over time. Understanding the historical context can help in interpreting such symbols accurately.
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What does this symbol mean \bar{\in}? I know what \in is but I never saw it with a line on top.

edit. I figured it out I think It was used because they can't print \notin
 
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Try typing the context or the formula you found that... the stand-alone symbol could mean anything!
 
I think you will find this in older manuscripts, before \notin became common.
 

Thread 'Area of Overlapping Squares'

Here is a little puzzle from the book 100 Geometric Games by Pierre Berloquin. The side of a small square is one meter long and the side of a larger square one and a half meters long. One vertex of the large square is at the center of the small square. The side of the large square cuts two sides of the small square into one- third parts and two-thirds parts. What is the area where the squares overlap?
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