uc(), a new indeterminate in the sequence of indeterminates
_2, ... is created successively.
uc()cannot be input on the keyboard. By this property, you are free, no matter how many indeterminates you will create dynamically by a program, from collision of created names with indeterminates input from the keyboard or from program files.
strtov(), are used to create ordinary indeterminates (indeterminates having 0 for their
uc()is 1. (
 A=uc(); _0  B=uc(); _1  (uc()+uc())^2; _2^2+2*_3*_2+_3^2  (A+B)^2; _0^2+2*_1*_0+_1^2
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