[Daily puzzle] No calculator math \ stacker news ~science

812 sats \ 20 comments \ @south_korea_ln 12 Oct science

Solve this without using a calculator. Several ways are possible... Show your logic, don't just write out the final number for this one.

This shouldn't be too difficult.

Previous iteration: #719143

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221 sats \ 0 replies \ @SimpleStacker 12 Oct

That's the area of a trapezoid with width 1 and heights 2 * 998 and 2 * 999, which is 1997

221 sats \ 2 replies \ @Undisciplined 12 Oct

43 sats \ 1 reply \ @south_korea_ln OP 12 Oct

And yet another way.

0 sats \ 0 replies \ @Undisciplined 12 Oct

I was fortunate that no one took mine.

221 sats \ 1 reply \ @Scroogey 12 Oct

(1000-1)^2 - (1000-2)^2 = 1000^2 - 2000 + 1 - 1000^2 + 4000 - 4 = 2000 - 3 = 1997

1 sat \ 0 replies \ @south_korea_ln OP 12 Oct

That's also one of the ways.

200 sats \ 1 reply \ @jakoyoh629 12 Oct

(999+998)(999-998)=1997*1=1997

25 sats \ 0 replies \ @south_korea_ln OP 12 Oct

That's indeed one of the ways.

1 sat \ 11 replies \ @ChrisS 12 Oct

How do I learn more about how to do the math symbols in markup? Is there a way to see the raw markup on posts?

1 sat \ 9 replies \ @south_korea_ln OP 12 Oct

It's not really markup, it's MathJax.

Mathjax supports different syntaxes: MathML, TeX, and ASCIImath.

I use TeX. There are plenty of tutorials on how to write equations in TeX.

$$
a^3 + \sqrt{3} + \frac{1}{a+\hbar}+\int_{i=1}^a \exp{(iax)} dx < \infty
$$

for instance will yield

I did not test MathML and ASCIImath here yet.

0 sats \ 8 replies \ @Scroogey 12 Oct

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22 sats \ 6 replies \ @SimpleStacker 12 Oct

Single dollar signs work in latex but not in mathjax. Probably because single dollar sign is too common in regular html

1 sat \ 5 replies \ @south_korea_ln OP 12 Oct

Oh really? I think I already used it too.

Let's try. $\sqrt{2}$ (single dollar, inline) and double dollar (block equation):

1 sat \ 4 replies \ @SimpleStacker 13 Oct

Oh, hmm. The implementation I use in my website doesn't allow single dollar signs.

It's actually probably better that way, since I've seen dollar signs mess up other peoples' posts here.

11 sats \ 2 replies \ @south_korea_ln OP 13 Oct

SN's newest update deactivated single dollar signs... As can be seen here :)

Let's try the alternative for inline equation: ( \sqrt{3} )

0 sats \ 1 reply \ @SimpleStacker 13 Oct

I believe double dollar signs works for

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1 sat \ 0 replies \ @south_korea_ln OP 13 Oct

Oh, let me know when that happens. It's probably something easy to address in the settings of the MathJax library used here.

1 sat \ 0 replies \ @025738dda8 12 Oct

In TeX, single $ means "change to math typesetting mode" (treat it as"inline" math). The double $$ is similar, just it typesets it as a separate block of math/figure (it adds alignment, spacing, etc.).

I'd expect similar behaviour.

0 sats \ 0 replies \ @Scroogey 12 Oct

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