Earlier quoted context omitted.
> which I have swutch to That's a past participle I've never seent before
For some reason part participles are particularly hard for me too (native English speaker who speaks no other languages fluently). (they must just be a mess in English? I can't imagine how non-native speakers ever get any of them) I'm going to go with swutcheted
Lewis Carroll – computing the day of the week for any given date (1887)
51–60 of 109 posts
Re: Lewis Carroll – computing the day of the week for any given date (1887)
#52This is very similar to the method I use and, after conversation with him, the method Art Benjamin uses. It's trivial to do in 10 to 15 seconds, though it requires practice, a very small amount of memorisation[0], and a small amount of mental arithmetic. I use it regularly, partly to keep in practice, and partly because once you have the skill you find it's surprisingly useful. JH Conway used a different technique[1]…
Re: Lewis Carroll – computing the day of the week for any given date (1887)
#53Neat but what is this useful for?
Re: Lewis Carroll – computing the day of the week for any given date (1887)
#54This is very similar to the method I use and, after conversation with him, the method Art Benjamin uses. It's trivial to do in 10 to 15 seconds, though it requires practice, a very small amount of memorisation[0], and a small amount of mental arithmetic. I use it regularly, partly to keep in practice, and partly because once you have the skill you find it's surprisingly useful. JH Conway used a different technique[1]…
You don't have to take the mod 7 of each of the values. You can sum them into one number and take its mod 7. You'll get the same result.
No, you don't need to do it relentlessly as you go, but it can be used in an ad hoc manner to keep the numbers small.
Having said that, if you have 24, you can reduce it (mod 7) to 10, which you might find it easier to work with rather than reducing it to 3. Similarly if you start with 27 you can reduce it to -1 (mod 7). You don't always need to reduce things to the range [0..7).
(Note, by convention the square bracket implies "included" and the round bracket implies "excluded", so [0..7) is the collection {0,1,2,3,4,5,6}.)
Re: Lewis Carroll – computing the day of the week for any given date (1887)
#55This is very similar to the method I use and, after conversation with him, the method Art Benjamin uses. It's trivial to do in 10 to 15 seconds, though it requires practice, a very small amount of memorisation[0], and a small amount of mental arithmetic. I use it regularly, partly to keep in practice, and partly because once you have the skill you find it's surprisingly useful. JH Conway used a different technique[1]…
Re: Lewis Carroll – computing the day of the week for any given date (1887)
#56Re: Lewis Carroll – computing the day of the week for any given date (1887)
#57This is very similar to the method I use and, after conversation with him, the method Art Benjamin uses. It's trivial to do in 10 to 15 seconds, though it requires practice, a very small amount of memorisation[0], and a small amount of mental arithmetic. I use it regularly, partly to keep in practice, and partly because once you have the skill you find it's surprisingly useful. JH Conway used a different technique[1]…
> which I have swutch to That's a past participle I've never seent before
Re: Lewis Carroll – computing the day of the week for any given date (1887)
#58Reading the article, I wandered into the difference of Old Style and New Style dates and what happened in 1752. From [1]: By the 18th century, the English legal year – used for legal, financial and other civil purposes – had for centuries begun on 25 March, or Lady Day.[13][i] Thus, for example, 24 March 1707 was immediately followed by 25 March 1708, while the day following 31 December 1708 was 1 January 1708, with…
Although disputed by some, apparently the switch to the Gregorian calendar is also the basis for "April Fools' Day."
Re: Lewis Carroll – computing the day of the week for any given date (1887)
#59Re: Lewis Carroll – computing the day of the week for any given date (1887)
#60Earlier quoted context omitted.
> which I have swutch to That's a past participle I've never seent before
Like the joke of the guy returning to Boston after being away for years; asks his cab driver "Do you know where I can get scrod" and the driver says "Sure, but I've never heard that in the past perfect before!"