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Maxima unable to simplify sqrt(3-2*sqrt(2)) #609

Open rtoy opened 3 months ago

rtoy commented 3 months ago

Imported from SourceForge on 2024-07-03 02:09:25 Created by cheesecracker on 2017-08-22 07:46:07 Original: https://sourceforge.net/p/maxima/bugs/3326

sqrt(3-2*sqrt(2)) cannot be simplified as sqrt(2) - 1 in Maxima 5.40.0

Is there anything I miss or I can do? Or does it need to be hard-coded into Maxima?

Here are the steps of simplification: https://youtu.be/naGkELTaSuQ

FYI: WolframAlpha result)

Thanks

build_info version="5.40.0",timestamp="2017-06-01 18:54:32",host="x86_64-w64-mingw32",lisp_name="CLISP",lisp_version="2.49 (2010-07-07) (built on toshiba [192.168.43.206])"

rtoy commented 3 months ago

Imported from SourceForge on 2024-07-03 02:09:26 Created by cheesecracker on 2017-08-22 07:48:17 Original: https://sourceforge.net/p/maxima/bugs/3326/#b2ca

Broken link due to formatting.

The link to WolframAlpha should be https://www.wolframalpha.com/input/?i=sqrt(3-2*sqrt(2))

rtoy commented 3 months ago

Imported from SourceForge on 2024-07-03 02:09:29 Created by kjak on 2017-08-22 07:56:14 Original: https://sourceforge.net/p/maxima/bugs/3326/#72b1

rtoy commented 3 months ago

Imported from SourceForge on 2024-07-03 02:09:33 Created by kjak on 2017-08-22 07:56:14 Original: https://sourceforge.net/p/maxima/bugs/3326/#b5bc

Here's one way:

(%i1) load("sqdnst")$

(%i2) sqrtdenest(sqrt(3-2*sqrt(2)));
(%o2) sqrt(2)-1

So I'm closing this as wont-fix.

rtoy commented 3 months ago

Imported from SourceForge on 2024-07-03 02:09:36 Created by cheesecracker on 2017-08-22 09:50:07 Original: https://sourceforge.net/p/maxima/bugs/3326/#f42e

I see. But load("sqdnst")$ looks like advanced feature for newbies of this software. But simplifying this expression should not be considered as advanced math. Anyway, WolframAlpha shows the answer without requiring users to switch to any advanced feature.

Could Maxima be configured to make this load(...) by default and use sqrtdenest(..) when we call "Simplify Expression"?

rtoy commented 3 months ago

Imported from SourceForge on 2024-07-03 02:09:40 Created by kjak on 2017-08-22 14:49:38 Original: https://sourceforge.net/p/maxima/bugs/3326/#00b5

sqrtdenest just happened to be the first thing I tried, so there may be easier ways.

The reason I went ahead and closed this as wont-fix is because the title and description were specifically about Maxima being unable to "simplify" a particular expression, when it actually can.

Instead of going straight to opening up bug reports, you could post to the mailing list. While you're not guaranteed a response, the list is active and has some knowledgeable people who don't browse the bug reports. Some of them work with (nested) radicals much more often than I do. If you have questions, I'd suggest posting there.

http://maxima.sourceforge.net/maximalist.html

rtoy commented 3 months ago

Imported from SourceForge on 2024-07-03 02:09:43 Created by cheesecracker on 2017-08-22 22:59:49 Original: https://sourceforge.net/p/maxima/bugs/3326/#0ed4

OK, thanks for the tips to mailing-list. I'll try that.

rtoy commented 3 months ago

Imported from SourceForge on 2024-07-03 02:09:47 Created by vanzandt on 2017-08-23 02:50:26 Original: https://sourceforge.net/p/maxima/bugs/3326/#00b5/d3b9

I would like to second the original bug report. I've recently been dealing with a number of nested radicals, and was disappointed that Maxima couldn't simplify them. I wrote an awkward workaround. I certainly didn't find that loadable package. And I don't consider that a good solution anyway. Half the reason for using Maxima is automatic simplification. I should not have to rummage through the toolbox looking for something appropriate - or to rely on the kindness of strangers to point the way.

I'll be happy to use sqrtdenest now that you have pointed it out. But why can't Maxima recognize the class of expression handled by sqrtdenest, and use it? Seems like a bug to me.

On Aug 22, 2017 8:49 AM, "Kris Katterjohn via Maxima-bugs" < maxima-bugs@lists.sourceforge.net> wrote:

sqrtdenest just happened to be the first thing I tried, so there may be easier ways.

The reason I went ahead and closed this as wont-fix is because the title and description were specifically about Maxima being unable to "simplify" a particular expression, when it actually can.

Instead of going straight to opening up bug reports, you could post to the mailing list. While you're not guaranteed a response, the list is active and has some knowledgeable people who don't browse the bug reports. Some of them work with (nested) radicals much more often than I do. If you have questions, I'd suggest posting there.

http://maxima.sourceforge.net/maximalist.html

Status: wont-fix Group: None Created: Tue Aug 22, 2017 07:46 AM UTC by cheesecracker Last Updated: Tue Aug 22, 2017 09:50 AM UTC Owner: nobody

sqrt(3-2sqrt(2)) cannot be simplified as sqrt(2) - 1* in Maxima 5.40.0

Is there anything I miss or I can do? Or does it need to be hard-coded into Maxima?

Here are the steps of simplification: https://youtu.be/naGkELTaSuQ

FYI: WolframAlpha result http://https://www.wolframalpha.com/input/?i=sqrt(3-2*sqrt(2))

Thanks

build_info version="5.40.0",timestamp="2017-06-01 18:54:32",host="x86_64-w64- mingw32",lisp_name="CLISP",lisp_version="2.49 (2010-07-07) (built on toshiba [192.168.43.206])"

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