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Permalink In reply to by Anonymous (not verified)

Z is not an unknown variable. It is used to identify the infinite series 1-1+1-1+1-1+1-........

so when he said 1 - z = z, he meant

1 - (1-1+1-1+1-1+1-1+...) = 1-1+1-1+1-1+.....

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