Typos: p. 26: w''(t) = a w(t) (sign) p. 26: 4 (-1)^{(n-1)/2}/(n^2 pi 100) (square and 100 missing) p. 26: (2m+1)^2 pi 100 in denominator (dito) p. 28: T_y(x,0)=T_y(x,pi)=0) (the (y,pi) must be (x,pi) )
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