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WEIERSTRASS'S NON-DIFFERENTIABLE FUNCTION

WEIERSTRASS'S NON-DIFFERENTIABLE FUNCTION

WEIERSTRASS'S NON-DIFFERENTIABLE FUNCTION

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316 G. H. HARDY: [July<br />

and that J2 and Ji tend to limits X2 and -A, the former of these limits, for<br />

example, being given by the formula<br />

wherein t = — T.<br />

Suppose next that T -* » . Then we have, in -£3,<br />

r-o(i) ^- dG 0{1)*<br />

G~0(1)' dn-~dt~a^ '<br />

log7=0(f2)' ¿log7=-^log7 = 0(¿)'<br />

uniformly for 0 ^= a ^= ß. Thus «A -* 0, and similarly Xt -» 0. Also -A<br />

and J3 obviously tend to limits X and

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