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812fdd471e96b34126b2763a2c63cf0be8ee459f
[ar1516.git]
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a2
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src
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3a.prvr9
1
formulas(assumptions).
2
all x all y all z (x*(y*z)=(x*y)*z).
3
all x (x*I=x).
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all x (x*inv(x)=I).
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end_of_list.
6
formulas(goals).
7
%I*x=x.
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%inv(inv(x))=x.
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%inv(x)*x=I.
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all x all y (x*y=y*x).
11
end_of_list.