Signature (englanti)
Etsi sanaa " Signature " NRICH | PLUS | maths.org | Googlella
Määritelmä taso 5
A number
denoting whether a permutation (i1,i2, …,ik) differs from the natural order by an odd or even number of steps, taking the value +1 for an even and −1 for an odd number of steps.
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Rahoittajat: EU Socrates Minerva, HeyMath!, Cambridge University Press