olemus
vähim selline positiivne täisarv p, millega kehtib
px = 0 korpuse iga elemendi x korral, 
kus skalaariga korrutamine px tähendab

elemendi x liitmist iseendaga p korda, st x + x + … + x  
= the smallest number of times one needs to add the multiplicative identity to get the additive identity

ülevaateid
https://www.reddit.com/r/learnmath/comments/l7hp7x/what_is_the_characteristic_of_a_field/?rdt=60770
https://en.wikipedia.org/wiki/Characteristic_(algebra)
http://mathworld.wolfram.com/FieldCharacteristic.html
https://www.maths.tcd.ie/pub/Maths/Courseware/NumberTheory/2016/ch07.pdf