Operators are not immutable. Operator properties are dynamic and among other things affect equality!

(1) -> f:=operator 'f

(1)

g:=operator 'f

(2)

test(f=g)

(3)

test(kernels f(x) = kernels g(x))

(4)

test(f(x)=g(x))

(5)

name f

(6)

name g

(7)

Change or add a property.

display(g,(x:List OutputForm):OutputForm+->prefix('G,x)$OutputForm)

(8)

g(x)

(9)

test(f=g)

(10)

test(kernels f(x) = kernels g(x))

(11)

test(f(x)=g(x))

(12)

name f

(13)

name g

(14)