refactoring mul._eval_oseries
refactoring mul._eval_oseries

VaibhavAgarwalVA/sympy,kaushik94/sympy,farhaanbukhsh/sympy,asm666/sympy,maniteja123/sympy,yukoba/sympy,ChristinaZografou/sympy,mafiya69/sympy,saurabhjn76/sympy,sunny94/temp,AunShiLord/sympy,souravsingh/sympy,kaichogami/sympy,beni55/sympy,abloomston/sympy,aktech/sympy,mcdaniel67/sympy,liangjiaxing/sympy,cswiercz/sympy,MridulS/sympy,meghana1995/sympy,jbaayen/sympy,cccfran/sympy,cccfran/sympy,moble/sympy,Arafatk/sympy,sampadsaha5/sympy,lidavidm/sympy,MridulS/sympy,hrashk/sympy,jaimahajan1997/sympy,Sumith1896/sympy,ChristinaZografou/sympy,Arafatk/sympy,lindsayad/sympy,abloomston/sympy,iamutkarshtiwari/sympy,lindsayad/sympy,iamutkarshtiwari/sympy,lidavidm/sympy,saurabhjn76/sympy,fperez/sympy,Mitchkoens/sympy,skidzo/sympy,yukoba/sympy,drufat/sympy,diofant/diofant,jerli/sympy,shipci/sympy,ga7g08/sympy,vipulroxx/sympy,flacjacket/sympy,tovrstra/sympy,abloomston/sympy,atreyv/sympy,skirpichev/omg,pbrady/sympy,sunny94/temp,mafiya69/sympy,postvakje/sympy,MechCoder/sympy,chaffra/sympy,grevutiu-gabriel/sympy,pbrady/sympy,beni55/sympy,toolforger/sympy,kevalds51/sympy,abhiii5459/sympy,beni55/sympy,Vishluck/sympy,yashsharan/sympy,mcdaniel67/sympy,Gadal/sympy,dqnykamp/sympy,moble/sympy,moble/sympy,garvitr/sympy,mattpap/sympy-polys,Mitchkoens/sympy,AkademieOlympia/sympy,ryanGT/sympy,mafiya69/sympy,Curious72/sympy,hrashk/sympy,Titan-C/sympy,kaichogami/sympy,skidzo/sympy,ChristinaZografou/sympy,Designist/sympy,Vishluck/sympy,bukzor/sympy,sahilshekhawat/sympy,vipulroxx/sympy,minrk/sympy,pandeyadarsh/sympy,liangjiaxing/sympy,shikil/sympy,pernici/sympy,cccfran/sympy,pandeyadarsh/sympy,abhiii5459/sympy,garvitr/sympy,madan96/sympy,jamesblunt/sympy,debugger22/sympy,hargup/sympy,jamesblunt/sympy,Mitchkoens/sympy,mcdaniel67/sympy,farhaanbukhsh/sympy,meghana1995/sympy,shikil/sympy,kevalds51/sympy,yashsharan/sympy,ga7g08/sympy,Gadal/sympy,ahhda/sympy,Vishluck/sympy,sahmed95/sympy,maniteja123/sympy,amitjamadagni/sympy,jaimahajan1997/sympy,Davidjohnwilson/sympy,chaffra/sympy,atreyv/sympy,atreyv/sympy,yashsharan/sympy,kmacinnis/sympy,MechCoder/sympy,wyom/sympy,srjoglekar246/sympy,Shaswat27/sympy,VaibhavAgarwalVA/sympy,kaichogami/sympy,bukzor/sympy,kaushik94/sympy,Gadal/sympy,Designist/sympy,lindsayad/sympy,emon10005/sympy,liangjiaxing/sympy,wyom/sympy,asm666/sympy,jerli/sympy,grevutiu-gabriel/sympy,toolforger/sympy,Curious72/sympy,AkademieOlympia/sympy,MridulS/sympy,wanglongqi/sympy,kumarkrishna/sympy,Shaswat27/sympy,MechCoder/sympy,sahmed95/sympy,sahmed95/sympy,shikil/sympy,oliverlee/sympy,Titan-C/sympy,wyom/sympy,jamesblunt/sympy,debugger22/sympy,jbbskinny/sympy,Curious72/sympy,aktech/sympy,abhiii5459/sympy,atsao72/sympy,kmacinnis/sympy,rahuldan/sympy,jbbskinny/sympy,jbbskinny/sympy,ga7g08/sympy,Sumith1896/sympy,hazelnusse/sympy-old,VaibhavAgarwalVA/sympy,cswiercz/sympy,kevalds51/sympy,asm666/sympy,postvakje/sympy,emon10005/sympy,cswiercz/sympy,rahuldan/sympy,toolforger/sympy,wanglongqi/sympy,Davidjohnwilson/sympy,chaffra/sympy,hargup/sympy,lidavidm/sympy,madan96/sympy,sahilshekhawat/sympy,dqnykamp/sympy,sampadsaha5/sympy,bukzor/sympy,rahuldan/sympy,KevinGoodsell/sympy,sunny94/temp,skidzo/sympy,emon10005/sympy,atsao72/sympy,souravsingh/sympy,hazelnusse/sympy-old,minrk/sympy,iamutkarshtiwari/sympy,kumarkrishna/sympy,drufat/sympy,atsao72/sympy,AunShiLord/sympy,Sumith1896/sympy,AunShiLord/sympy,hargup/sympy,ahhda/sympy,shipci/sympy,drufat/sympy,Arafatk/sympy,ahhda/sympy,Davidjohnwilson/sympy,meghana1995/sympy,sampadsaha5/sympy,yukoba/sympy,maniteja123/sympy,madan96/sympy,jerli/sympy,souravsingh/sympy,wanglongqi/sympy,oliverlee/sympy,saurabhjn76/sympy,postvakje/sympy,AkademieOlympia/sympy,Designist/sympy,pbrady/sympy,shipci/sympy,kaushik94/sympy,grevutiu-gabriel/sympy,dqnykamp/sympy,jaimahajan1997/sympy,Shaswat27/sympy,garvitr/sympy,kmacinnis/sympy,vipulroxx/sympy,pandeyadarsh/sympy,hrashk/sympy,Titan-C/sympy,aktech/sympy,farhaanbukhsh/sympy,sahilshekhawat/sympy,kumarkrishna/sympy,debugger22/sympy,amitjamadagni/sympy,oliverlee/sympy