Let f be defined by:                1,   x rational f(x)={                0,   x irrational ;prove that for no number c does limx->c f(x) exist

Advanced Engineering Mathematics
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ISBN:9780470458365
Author:Erwin Kreyszig
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Chapter2: Second-order Linear Odes
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Let f be defined by:

               1,   x rational

f(x)={

               0,   x irrational

;prove that for no number c does limx->c f(x) exist

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Step 1

To prove that for no number C foes limit x tends to c f(x) exist. 

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