# Exponentiation expression (math)

Discussion in 'Test Forum' started by FanJ, Jan 29, 2022.

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Is it possible to use the arrow-up expression here on the board software or by using sup?
If so, how?

I mean:
You can express it like in 2**4 = 16
(explanation: 2**4 means 2 x 2 x 2 x 2 )

Those two characters * could be replaced by the arrow-up or by using sup.

Examples:

or

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3. ### 1PWRegistered Member

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Hello @FanJ

24 = 16

H2O

Code:
```2[sup]4[/sup] = 16

H[sub]2[/sub]O
```
HTH

Last edited: Jan 29, 2022

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Thanks a lot @1PW

That works!

24=16

Edit: and the water expression too using sub
H2O

Last edited: Jan 29, 2022
5. ### 1PWRegistered Member

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Awesome!

6. ### JRViejoSuper Moderator

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Thanks JR That works too

2↑4=16

PS-2: maybe I find using sup a bit more clear

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Now you might ask why I started at all talking about that expression.
(I could have started a new thread but let's go on here)

The reason is the number 65536

65536 = 216

Does that ring any bell? That number 16 maybe? Maybe you knew already about it (of course).
Yes, it has to do with computers and software; in particular older ones.

Now why all this?
It has to do with that number, the covid-19 testing in the Netherlands and the huge back-log in reporting those numbers (some 76000) to the central Health organisation RIVM.
In an article at the site of the Dutch Public Broadcaster NOS the question was raised whether that number 76000 had to do with that number 65536.
That could have been. Well, now we go to this Wikipedia site:
https://en.wikipedia.org/wiki/65,536
You can read there that, for example, older Excel software cannot read more than 65536 rows in spreadsheets.
See why the question was raised?

That could have been the explanation. But that seems not be the case (well, let's hope that that is right).
Manpower to get the numbers (via three steps (ough)) to the central Health organisation RIVM seems to be the issue.

End of story but it gives some insight what using older systems might cause.

9. ### JRViejoSuper Moderator

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Yes, sup and sub are easier than Alt keys.