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Question: Why does this procedure definition work when I name it with a subscript containing "1" but not "I"?

Question:Why does this procedure definition work when I name it with a subscript containing "1" but not "I"?

zenterix 405 Maple 2022
procedure 2dmath differentiation
March 03 2025
0

Below is a simple demonstration of something that I am very confused about in another worksheet I am working on.

Basically, I have a function of x called psi_I and I want to define another function of x called psi_I,d which is just the derivative of psi_I.

In, the snippet below, this works if I use the variable names psi_1 and psi_1,d, but not if I replace the "1" with a "I" as I want to do.

In addition, I don't know why the output (6) is different from (7) or (8). All three are from the same command in Maple.

restart

`ψ__1` := proc (x) options operator, arrow; C*exp(a*x) end proc

proc (x) options operator, arrow; C*exp(a*x) end proc

 (1)

`ψ__1,d` := unapply(diff(`ψ__1`(x), x), x)

proc (x) options operator, arrow; C*a*exp(a*x) end proc

 (2)

`ψ__1,d`(x)

C*a*exp(a*x)

 (3)

NULL

restart

`ψ__I` := proc (x) options operator, arrow; C*exp(a*x) end proc

proc (x) options operator, arrow; C*exp(a*x) end proc

 (4)

`ψ__I,d` := unapply(diff(`#msub(mi("psi",fontstyle = "normal"),mi("1"))`(x), x), x)

D(psi__1)

 (5)

`#msub(mi("psi",fontstyle = "normal"),mi("1,d"))`(x)

`psi__1,d`(x)

 (6)

`#msub(mi("psi",fontstyle = "normal"),mi("I,d"))`(x)

(D(psi__1))(x)

 (7)

`ψ__I,d`(x)

(D(psi__1))(x)

 (8)

NULL

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