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Moreover, notice that the "intuitive evaluation" is also ok, since both:

var('V R')
I(R) = V/R 
plot(I(3), (V, 0, 2))

and

var('V R')
I = V/R 
plot(I(R=3), (V, 0, 2))

work.

Moreover, notice that the "intuitive evaluation" is also ok, since both:

var('V R')
I = V/R 
plot(I(R=3), (V, 0, 2))

and

var('V R')
I(R) = V/R 
plot(I(3), (V, 0, 2))

andwork. But in the second case, it is less clear which is the variable that is being evaluated.

var('V R')
I = V/R 
plot(I(R=3), (V, 0, 2))

Moreover, notice that the "intuitive evaluation" is also ok, since both:

var('V R')
I = V/R 
plot(I(R=3), (V, 0, 2))

and

var('V R')
I(R) = V/R 
plot(I(3), (V, 0, 2))

work. But in the second case, it is less clear which is the variable that is being evaluated.work.