What is x in the Riemann Hypothesis?

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Th Riemann Hypothesis states that every 0 lies on x=0.5. What is x here?
 
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"x" is the real part of the complex number z= x+ iy. The Riemann hypothesis is that the real part of every (non-trivial) zero of the "Riemann zeta function" is equal to 1/2.
 
HallsofIvy said:
"x" is the real part of the complex number z= x+ iy. The Riemann hypothesis is that the real part of every (non-trivial) zero of the "Riemann zeta function" is equal to 1/2.

Thanks.
 

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