The multiplicity objection against uploading optimism

Abstract Could we transfer you from your biological substrate to an electronic hardware by simulating your brain on a computer? The answer to this question divides optimists and pessimists about mind uploading. Optimists believe that you can genuinely survive the transition; pessimists think that surviving mind uploading is impossible. An influential argument against uploading optimism is the multiplicity objection. In a nutshell, the objection is as follows: If uploading optimism were true, it should be possible to create not only one, but multiple digital versions of you. However, you cannot literally become many. Hence, you cannot survive even a single instance of uploading, and optimism about uploading is misguided. In this paper, I will first spell out the multiplicity objection in detail and then provide a two-pronged defence against the objection. First, uploading pessimists cannot establish that uploading optimism has the contentious implication. Second, it is in fact plausible to think that we could become multiple distinct persons. Optimists’ hope for a digital afterlife is therefore not thwarted by the prospect of multiplicity.