Symbol Î in Number Theory: Prove & Math Symbol Index

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The symbol Î in number theory represents the mathematical notation for "is an element of," typically denoted as \in. The discussion includes a proof that if r and s are integers (r,s Î Z), then the expression 4r + 6s is even. Participants note that font rendering issues can cause confusion with symbols like \in. A recommendation is made for a comprehensive math symbol index, specifically a wiki that lists common symbols and their meanings. The conversation emphasizes the importance of understanding these symbols in mathematical contexts.
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What does the symbol Î mean in number theory? As in...
Prove if r,s Î Z, then 4r + 6s is even...

Also, where can I find a website with a comprehensive math symbol index?
 
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It should be \in. There's probably some conflict where they both use the same code or something like that.
 
Cristo is pointing out that what you see is a font translation/rendering problem, and quite correctly. I've had things like that happen and confuse the living ... out of me.
 

Thread 'Confusion about the Moyal-Weyl twist'

I am studying the mathematical formalism behind non-commutative geometry approach to quantum gravity. I was reading about Hopf algebras and their Drinfeld twist with a specific example of the Moyal-Weyl twist defined as F=exp(-iλ/2θ^(μν)∂_μ⊗∂_ν) where λ is a constant parametar and θ antisymmetric constant tensor. {∂_μ} is the basis of the tangent vector space over the underlying spacetime Now, from my understanding the enveloping algebra which appears in the definition of the Hopf algebra...
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