Add a docstring with doctests to Matrix.is_square
Add a docstring with doctests to Matrix.is_square

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