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Syme had vanished. A morning came, and he was missing from work: a few thoughtless people commented on his absence. On the next day nobody mentioned him. On the third day Winston went into the vestibule of the Records Department to look at the notice-board. One of the notices carried a printed list of the members of the Chess Committee, of whom Syme had been one. It looked almost exactly as it had looked before – nothing had been crossed out – but it was one name shorter. It was enough. Syme had ceased to exist: he had never existed. (2.5.1)
That Syme has vanished and ceased to exist on paper (or anywhere else, for that matter) means that for all historical purposes, he has never existed at all.
"Do you realize that the past, starting from yesterday, has been actually abolished? If it survives anywhere, it's in a few solid objects with no words attached to them, like that lump of glass there. Already we know almost literally nothing about the Revolution and the years before the Revolution. Every record has been destroyed or falsified, every book has been rewritten, every picture has been repainted, every statue and street and building has been renamed, and every date has been altered. And that process is continuing day-by-day and minute-by-minute. History has stopped. Nothing exists except an endless present in which the Party is always right. I know, of course, that the past is falsified, but it would never be possible for me to prove it, even when I did the falsification myself. After the thing is done, no evidence ever remains. The only evidence is inside my own mind, and I don't know with any certainty that any other human being shares my memories. Just in that one instance, in my whole life, I did possess actual concrete evidence after the event – years after it." (2.5.14, Winston to Julia)
Winston feels confident that, despite the Party’s control of information, and thus, the past, he alone had possession of evidence to prove the Party’s wrong – at least in his memory.
Four, five, six – seven times they met during the month of June. Winston had dropped his habit of drinking gin at all hours. He seemed to have lost the need for it. He had grown fatter, his varicose ulcer had subsided, leaving only a brown stain on the skin above his ankle, his fits of coughing in the early morning had stopped […]. (2.5.6)
And what he wanted, more even than to be loved, was to break down that wall of virtue, even if it were only once in his whole life. The sexual act, successfully performed, was rebellion. Desire was thoughtcrime. (1.6.16)