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@ used for an escape character; rules currently in force
are as follows.
The evaluated result of n-th input command
The evaluated result of the last command
The unit of imaginary number, square root of -1.
The number pi, the ratio of a circumference of the circle and its diameter.
Napier’s number, the base of natural logarithm.
A generator of GF(2^m), a finite field of characteristic 2, over GF(2). It is a root of an irreducible univariate polynomial over GF(2) which is set as the defining polynomial of GF(2^m).
@>, @<, @>=, @<=, @==, @&&, @||
Fist order logical operators. They are used in quantifier elimination.
 fctr(x^10-1); [[1,1],[x-1,1],[x+1,1],[x^4+x^3+x^2+x+1,1],[x^4-x^3+x^2-x+1,1]]  @@; [x^4+x^3+x^2+x+1,1]  eval(sin(@pi/2)); 1.000000000000000000000000000000000000000000000000000000000  eval(log(@e),20); 0.99999999999999999999999999998  @0; x^4-x^3+x^2-x+1  (1+@i)^5; (-4-4*@i)  eval(exp(@pi*@i)); -1.0000000000000000000000000000  (@+1)^9; (@^9+@^8+@+1)
As you can see in the above example,
results of toplevel computation can be referred to
This is convenient for users, while it sometimes imposes a heavy
burden to the garbage collector.
It may happen that GC time will rapidly increase after computing
a very large expression at the toplevel.
In such cases
delete_history) takes effect.
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