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There is an equation reads like:

$[\mathbf{A}^2]_{ij} = \sum_{k=1, \dots,n} a_{ik}a_{kj} <> 0$

I guess that the symbol $<>$ here means $\neq$ ? But I am not sure and failed to confirm the guess by Google.

Thank you!

Ann
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    Where are you seeing this notation? Can you cite your sources, please? Is the notation not defined in that source? – Xander Henderson Jan 18 '23 at 16:22
  • In the programming language BASIC, it means not equal to. But it could mean something different based on the context of your material – David P Jan 18 '23 at 16:23
  • Do you have a source where this appears? The only symbol that I know which fits that description is $\gtrless$. – Semiclassical Jan 18 '23 at 16:23
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    PARI/GP uses "<>" for "not equal" as well. – Peter Jan 18 '23 at 16:23
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    I wouldn't be surprised to meet this symbol, and understand it as $\not =$. But I haven't seen it in use for at least 50 years. – ancient mathematician Jan 18 '23 at 16:44
  • Thank you! It's from a reading material of a course Scientific Programming. The course is about Matlab/Python. Two comments link it to some programming languages, I think it makes sense because the course has something to do with programming. So it may be from some programming convention that means "not equal" :) Thank you for your help! – Ann Jan 18 '23 at 20:08

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