Where I live, we adjust our clocks for daylight-saving time—although personally I think the government has no place nannying everyone into getting up an hour earlier. (In my case, I guess it works out fine, since it just makes all my appointments an hour earlier, and I don’t have any so very early in the morning.)
Many people seem to use Mac or Linux because those operating systems are ‘more secure’ or ‘don’t get viruses’. And I have nothing against that—I want my next computer to be a Mac. But that’s not the problem.
When many maths students encounter the expression 0·999… = 1·000…, they are a bit uneasy. It challenges their preconceived notion that each number can be represented in one and only one decimal way. One stumbling-block might be that they think of 0·999… as a large but finite string of digits—even if they accept an infinite string of nines, they may still think in terms of there being a last digit ‘at infinity’. Also, some students imagine 0·999… as more of a ‘process’ than a representation of a number.
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