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How to check if a name not in initially ...

nm 12008 Maple 2025
programming indets
January 19 2026
1 2

I think I remeber doing this before but not sure and it is not in my cheat sheet.

Given an expression, I wanted to find all names in it. Which can be done using indets(f,name);

But then how to check if any of the names found are not in the Maple initial known names given in https://www.maplesoft.com/support/help/Maple/view.aspx?path=initialconstants

For example,

f:=x^2 - y^2+Pi;
indets(f,name);

Gives {Pi, x, y}  how does one then check if this list does not have any known name in it?

In this case Pi. I do not want to check explicitly for each name listed on the web page above.

Are these initial known names  grouped in some specific maple type that can be used to check against?

Or is there a command in Maple to return a list of all these initially known names? If so this list can be used to check against.

Asked google AI and it did not know.

Maple 2025.2

why DEtools:-DEplot gives different plot...

nm 12008 Maple 2025
ode numeric differential-equations
January 17 2026
1 0

Is the following behavior expected? using  t=0 .. 3*Pi  vs.  t=0 .. round(3*Pi) give different plots.  Why? Should not the plot be the same?

ps. do not know if I asked this before or not. I can't remember. Search in Mapleprimes is not easy.

> 

interface(version);

`Standard Worksheet Interface, Maple 2025.2, Windows 10, November 11 2025 Build ID 1971053`

> 

restart;
> 

ode := diff(y(t), t$2) + y(t)=0;
DEtools:-DEplot(ode, y(t), t=0 .. 3*Pi, y=-1 .. 1,[[y(0)=1,D(y)(0)=0]],linecolor=blue);

diff(diff(y(t), t), t)+y(t) = 0

> 

DEtools:-DEplot(ode, y(t), t=0 .. round(3*Pi), y=-1 .. 1,[[y(0)=1,D(y)(0)=0]],linecolor=blue);

 

 

Download deplot_with_round_jan_17_2026.mw

Is this a bug? Error, (in simpl/min) no...

nm 12008 Maple 2025
asympt multiseries
January 17 2026
0 0

Would this be considered a bug or expected?

Everytime I see internal error in red, for me, it tells me it is a bug. But wanted to check first what others think.

> 

restart;
> 

interface(version);

`Standard Worksheet Interface, Maple 2025.2, Windows 10, November 11 2025 Build ID 1971053`

> 

ode:=x^2*diff(y(x), x$2) + (cos(x)-1)*diff(y(x), x) + exp(x)*y(x) = 0;
sol:=dsolve(ode,y(x),type='series',x=0):
sol1:=eval(%, _C2=0):
sol2:=eval(%%, _C1=0):

x^2*(diff(diff(y(x), x), x))+(cos(x)-1)*(diff(y(x), x))+exp(x)*y(x) = 0

> 

Y:= unapply(rhs(sol1), x):
eval(lhs(ode), y=Y):
MultiSeries:-asympt(%, x);

Error, (in simpl/min) non-real argument to max/min: -13/2+1/2*I*3^(1/2)

> 

Y:= unapply(rhs(sol2), x):
eval(lhs(ode), y=Y):
MultiSeries:-asympt(%, x);

Error, (in simpl/min) non-real argument to max/min: -13/2-1/2*I*3^(1/2)

 

 

Download asympt_none_real_argument_jan_17_2026.mw

How to stack legends at bottom of a plot...

nm 12008 Maple 2025
legend plotting
January 15 2026
2 2

WHen plotting f(x) and g(x) on same plot, and putting legend at bottom (default), the legends show horizontally. i.e. f(x) then g(x) on same line.

I'd like the legend to be stacked vertically, just like when the legend on the right or left, But keep it at bottom. But want to do all this in code. Not using any UI context tools or mouse.

Here is an example

> 

restart;
> 

f:=x->x^3-x^2+1;
g:=x->6-2*x-x^2;
the_legend:=[typeset("f(x) = ",f(x)),typeset("g(x) = ",g(x))]:
plots[setoptions](font=[TIMES,16], labelfont=[TIMES,18]):
the_title:="Plot of f(x) and g(x)":
plot([f(x),g(x)],x=-5..5,
     'gridlines',
     'color'=['red','blue'],
     'legend'=the_legend,
     'legendstyle'=['location'='bottom'],
     'axes'='normal',
     'title'=the_title,  
     'scaling'='unconstrained');

proc (x) options operator, arrow; x^3-x^2+1 end proc

proc (x) options operator, arrow; 6-2*x-x^2 end proc

> 

#I want the above legend to be stacked vertically like the
#following one, but keep it at bottom
> 

plot([f(x),g(x)],x=-5..5,
     'gridlines',
     'color'=['red','blue'],
     'legend'=the_legend,
     'legendstyle'=['location'='right'],
     'axes'='normal',
     'title'=the_title,  
     'scaling'='unconstrained');

 

 

Download legend_question.mw

why doesn't 1/A=x/A simplify to 1=x unde...

nm 12008 Maple 2025
simplify simplification
January 12 2026
2 0

Given equation such as 1/A=x/A, at school we are allowed to write this as 1=x by canceling A on both side.

But in Maple, even if I tell it that A is not zero, it still refuses to simplify it and cancel A from both sides.

What could be the reson for this?

eq:= 1/A = x/A;
simplify(eq) assuming A<>0

Using Mathematica it does it:

I am not looking for workaround, I know how to force this if needed, one way could be

numer(normal((lhs-rhs)(eq)))=0

gives 1 - x = 0

My question is why Maple's simplify does not simplify it automatically? Even using simplify with size option did not. Is it just weakness in simplify or is there a subtle mathematical reason behind it which I am missing?

Maple 2025.2

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