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How is that proof?
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Existence by definition is to "have being or reality". Reality is the "state of things as they are". Therefore it doesn't matter if I or you exist or not, we are perceived and therefore exist as reality. Therefore I prove I am me because with your limited information of me, I being me is the most likely explanation presented and therefore what you perceive and accept as reality. Essentially, you can't prove I am not me and so by default I am me. "Humans accept the reality they are presented with", I being me is the only reality you are presented with and there in, the only one you can accept. ;)
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Your argument is invalid if this isn't reality.
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"This" being unspecific I assume you mean this thread. In that case this thread, being a subsequent part of the world, must be reality as reality is the way things are, via our individual perspective, in other words reality is a construction of the world based on our observation and perception. You and I can both perceive this thread, you may call it a topic or a forum but it has a definition. This proves that it is perceived and therefore reality