Analyze the following "proof". 0=0+0+0+... = (1 − 1) + (+1 − 1) + (+1 − 1) + ... = 1 + (−1 + 1) + (−1 + 1) + (−1 + 1) + ... = 1+0+0+0+... = 1 Can you identify the invalid step(s)? What can you conclude from this example?

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