Critical line

Critical line may refer to:

• In mathematics, a specific subset of the complex numbers asserted by the Riemann hypothesis to be the locus of all non-trivial zeroes of the Riemann zeta function
• Critical line theorem, a mathematical theorem saying that the proportion of nontrivial zeros of the Riemann zeta function lying on the critical line is greater than zero
• Critical line (thermodynamics), a higher-dimensional equivalent of a critical point
• Critical Line, an art exhibition
• Critical line method, a procedure in Portfolio optimization