Initially Known Names
Description
Declaring a Protected Name as Local
The following names are known, either as global or environment variables under user control or as names of constants known to certain functions.
Catalan
Catalan's constant = $\sum _{i=0}^{\mathrm{\infty}}\frac{{\left(\mathrm{-1}\right)}^{i}}{{\left(2i+1\right)}^{2}}$ and evalf(Catalan) is approximately 0.915965594.
constants
See constants (default is the sequence: false, gamma, infinity, true, Catalan, FAIL, Pi ).
Digits
number of digits carried in floats (default is 10). Digits is an environment variable.
FAIL
unknown truth in the context of Boolean evaluation using three-valued logic.
false
the value false (false) in the context of Boolean evaluation.
gamma
Euler's constant = $\underset{n\to \mathrm{\infty}}{lim}\left(\left(\sum _{i=1}^{n}\frac{1}{i}\right)-\mathrm{ln}\left(n\right)\right)$ and evalf(gamma) is approximately 0.5772156649.
gamma(n)
a series of constants such that gamma(n) = $\underset{m\to \mathrm{\infty}}{lim}\left(\sum _{k=1}^{m}\frac{{\mathrm{ln}\left(k\right)}^{n}}{k}-\frac{{\mathrm{ln}\left(m\right)}^{n+1}}{n+1}\right)$ . Also known as Stieltjes constants. gamma(0) = gamma, Euler's constant.
I
complex number such that I^2 = -1 (i). Internally, I is represented as Complex(1).
infinity
name for $\mathrm{\infty}$ used by some library functions.
integrate
initially assigned the function name int.
lasterror
See lasterror.
libname
pathnames of libraries read by Maple. By default, the root of the standard Maple library.
`mod`
initially assigned the function name modp; for symmetric representation, assign `mod` := mods; (mod is an operator). Mod is an environment variable.
NULL
initialized to the null expression sequence.
Order
truncation order for series (default is 6); see also Order. Order is an environment variable.
Pi
math constant $\mathrm{\pi}$ (pi); use Pi for calculations. evalf(Pi) is approximately 3.14159265.
printlevel
See printlevel (default is 1). Printlevel is an environment variable.
true
the value true (true) in the context of Boolean evaluation.
undefined
name for undefined used by some library functions.
If you prefer to use a protected name, you can do one of the following to avoid getting an error:
Use local to declare a local version of the name
Use unprotect to remove protection from the protected name
Note: It is not recommended that you remove protection from Maple protected names. If you must use a Maple protected name, you should declare a local version of the name.
See Also
Declaring a Protected Name Local
environment
inifcn
int
mod
option
status
undocumentednames
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