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Wrong, wrong, wrong.
A number is undefined if you can't figure out the answer. It has nothing to do with infinity. I can draw an arbitrary curve and draw a second line so that they would meet at a point, the limit would be undefined at that point.
Take the graph of 1/X=Y. As X approaches 0, Y approaches infinity. The limit of Y as X approaches 0 is infinity. However, at 0, Y is undefined. It is NOT infinity. Look at X=0. There is not a single point of 1/X=Y on that line. Therefore, there is no Y value for X=0.
You know what else is wrong? A number canNOT equal infinity. Infinity is not a number.
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