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Why is the pole of RC circuit 1/RC instead of -1/RC?

In a RC circuit, we choose the voltage of capacitance as the output voltage.
Then the transfer function is 1/(1+RCs).
According to the definition of pole,
let 1+RC
s=0, then s=-1/(RC)
Why I have seen so many times on text books that the pole is 1/RC?
Thanks!

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