# Critical point exponents inequalities - The Coopersmith inequolity

 P: 310 The Coopersmith inequolity: $$T=T_c, H\rightarrow 0^+$$ I'm confused by few things. What means $$H\rightarrow 0^+$$? And what difference will be if $$H\rightarrow 0^-$$? And what means $$T=T_c$$ if we can't measure $$T_c$$ in experiments? Then there is relation $$M \sim H^{\frac{1}{\delta}}$$ That means if I understand well that $$\frac{1}{\delta}=\lim_{H\rightarrow 0}\frac{lnM(H)}{lnH}$$ Correct?
 P: 310 Any answer?

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