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lcz

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6 years, 163 days
changsha, China
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These are questions asked by lcz

How to make function composition easi...

lcz 1039 Maple
composition rtfm
April 21 2020
1 0

 I'd like to  make following function  composition 6 times,  the  notation @  is used  6 times.  How to write it easily?

f:=x->sqrt(1+x);
(f@f@f@f@f@f)(x)

how to integrate arccos(x)*arcsin(x)?...

lcz 1039 Maple 2020
integration
April 17 2020
3 1

This Anti-derivative of  arccos(x)*arcsin(x), Maple  2020 cannot do that? It seems not difficult.

int(arccos(x)*arcsin(x),x)

In Mathematica, we can easily to get output :

2 x - Sqrt[1 - x^2] ArcSin[x] +  ArcCos[x] (Sqrt[1 - x^2] + x ArcSin[x])

Physics Updates" version "642 is  insta...

lcz 1039 Maple 2020
physics
April 16 2020
1 1

Today I Installed  Physics Updates" version "642 in Maple2020, why does it tell me  it has installed but is not active? How to active it?

Physics:-Version(latest)

`The "Physics Updates" version "642" is installed but is not active. The active version of Physics is within the library D:\\Program Files\\Maple 2020\\lib\\maple.mla, created 2020, March 5, 9:36 hours`

Which function is good for displaying...

lcz 1039 Maple 2019
color maplets
April 09 2020
1 4

 

In maple, how to change strings style? Thanks!  

In Mathematica , we can choose Style to change strings style.

Style["A", Blue, Italic, 24]

 

source of the  problem : I make an User Interface.

the color of   "mass "  may consider be changed to  red . 

 

Empty result set on `pdsolve` in Maple2...

lcz 1039 Maple 2019
pde pdsolve differential-equations
April 06 2020
1 1

 Hello! I'm trying to solve the following: 

pde1 := (y+z)*(diff(u(x, y, z), x))+(z+x)*(diff(u(x, y, z), y))+(x+y)*(diff(u(x, y, z), z)) = 0;
{pdsolve(pde1,u(x,y,z))}

Unfortunately, after calling pdsolve , I get an empty result set . Can you help me figure out what's going on?  Does it  really have no solution? 

 

 

 

 

 

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