[分析] 2D數列收斂問題

[GSXSP (Gloria)]

Let u(n,m) be a 2D sequence

if

lim lim u(n,m) = lim lim u(n,m) = L
 n   m            m   n


prove or disprove

lim u(n,n)  exist  and  lim u(n,n) = L
 n                       n

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