polys: Guard against negative exponents in PolyElement.__pow__
polys: Guard against negative exponents in PolyElement.__pow__

cccfran/sympy,iamutkarshtiwari/sympy,MechCoder/sympy,grevutiu-gabriel/sympy,aktech/sympy,Davidjohnwilson/sympy,hrashk/sympy,yukoba/sympy,shikil/sympy,Vishluck/sympy,abloomston/sympy,atreyv/sympy,asm666/sympy,Shaswat27/sympy,yukoba/sympy,chaffra/sympy,wyom/sympy,atreyv/sympy,hrashk/sympy,cswiercz/sympy,jamesblunt/sympy,kmacinnis/sympy,pandeyadarsh/sympy,mafiya69/sympy,yashsharan/sympy,iamutkarshtiwari/sympy,sahilshekhawat/sympy,abloomston/sympy,Shaswat27/sympy,skirpichev/omg,mcdaniel67/sympy,cswiercz/sympy,beni55/sympy,MridulS/sympy,pbrady/sympy,vipulroxx/sympy,liangjiaxing/sympy,sahmed95/sympy,souravsingh/sympy,asm666/sympy,sunny94/temp,ChristinaZografou/sympy,emon10005/sympy,moble/sympy,jerli/sympy,wanglongqi/sympy,farhaanbukhsh/sympy,wyom/sympy,sunny94/temp,kumarkrishna/sympy,cccfran/sympy,Titan-C/sympy,shipci/sympy,VaibhavAgarwalVA/sympy,lindsayad/sympy,toolforger/sympy,shikil/sympy,MechCoder/sympy,Designist/sympy,jaimahajan1997/sympy,mafiya69/sympy,lindsayad/sympy,kumarkrishna/sympy,Sumith1896/sympy,chaffra/sympy,kaushik94/sympy,abhiii5459/sympy,shipci/sympy,hargup/sympy,vipulroxx/sympy,wanglongqi/sympy,sahmed95/sympy,kaichogami/sympy,Sumith1896/sympy,lidavidm/sympy,kmacinnis/sympy,Titan-C/sympy,shikil/sympy,Gadal/sympy,dqnykamp/sympy,liangjiaxing/sympy,drufat/sympy,Sumith1896/sympy,AunShiLord/sympy,cccfran/sympy,Curious72/sympy,ga7g08/sympy,kaichogami/sympy,rahuldan/sympy,Curious72/sympy,souravsingh/sympy,kaushik94/sympy,MechCoder/sympy,pandeyadarsh/sympy,pandeyadarsh/sympy,jerli/sympy,debugger22/sympy,kmacinnis/sympy,AkademieOlympia/sympy,atreyv/sympy,Mitchkoens/sympy,vipulroxx/sympy,jbbskinny/sympy,jaimahajan1997/sympy,pbrady/sympy,maniteja123/sympy,sahilshekhawat/sympy,yukoba/sympy,farhaanbukhsh/sympy,madan96/sympy,mcdaniel67/sympy,ahhda/sympy,liangjiaxing/sympy,Gadal/sympy,debugger22/sympy,sampadsaha5/sympy,kaushik94/sympy,ga7g08/sympy,kevalds51/sympy,Vishluck/sympy,AunShiLord/sympy,ChristinaZografou/sympy,Mitchkoens/sympy,AkademieOlympia/sympy,saurabhjn76/sympy,dqnykamp/sympy,aktech/sympy,beni55/sympy,grevutiu-gabriel/sympy,pbrady/sympy,skidzo/sympy,oliverlee/sympy,Davidjohnwilson/sympy,shipci/sympy,diofant/diofant,bukzor/sympy,postvakje/sympy,saurabhjn76/sympy,cswiercz/sympy,hargup/sympy,Vishluck/sympy,sahmed95/sympy,sampadsaha5/sympy,maniteja123/sympy,Gadal/sympy,garvitr/sympy,yashsharan/sympy,ChristinaZografou/sympy,AunShiLord/sympy,aktech/sympy,mafiya69/sympy,Shaswat27/sympy,beni55/sympy,hargup/sympy,ahhda/sympy,meghana1995/sympy,lidavidm/sympy,ahhda/sympy,Designist/sympy,souravsingh/sympy,Arafatk/sympy,moble/sympy,Curious72/sympy,bukzor/sympy,meghana1995/sympy,atsao72/sympy,saurabhjn76/sympy,rahuldan/sympy,lindsayad/sympy,Davidjohnwilson/sympy,postvakje/sympy,postvakje/sympy,ga7g08/sympy,Mitchkoens/sympy,kumarkrishna/sympy,jamesblunt/sympy,moble/sympy,abhiii5459/sympy,Designist/sympy,wyom/sympy,MridulS/sympy,madan96/sympy,abhiii5459/sympy,garvitr/sympy,toolforger/sympy,rahuldan/sympy,dqnykamp/sympy,wanglongqi/sympy,toolforger/sympy,abloomston/sympy,sampadsaha5/sympy,farhaanbukhsh/sympy,maniteja123/sympy,sahilshekhawat/sympy,skidzo/sympy,emon10005/sympy,Titan-C/sympy,jaimahajan1997/sympy,Arafatk/sympy,asm666/sympy,lidavidm/sympy,jbbskinny/sympy,skidzo/sympy,debugger22/sympy,VaibhavAgarwalVA/sympy,drufat/sympy,meghana1995/sympy,AkademieOlympia/sympy,oliverlee/sympy,yashsharan/sympy,atsao72/sympy,hrashk/sympy,iamutkarshtiwari/sympy,chaffra/sympy,garvitr/sympy,oliverlee/sympy,mcdaniel67/sympy,kevalds51/sympy,VaibhavAgarwalVA/sympy,jbbskinny/sympy,atsao72/sympy,jamesblunt/sympy,grevutiu-gabriel/sympy,madan96/sympy,emon10005/sympy,drufat/sympy,jerli/sympy,kevalds51/sympy,bukzor/sympy,sunny94/temp,kaichogami/sympy,Arafatk/sympy,MridulS/sympy