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Sometimes, the hyphen as subscript doesn't appear : see the A_- in the fragment

pp= Graphics()
sage: pp+=text("$A_-$",(0,0),axes=False,fontsize=20)
sage: pp+=text("$B_-C_+$",(1,0),axes=False,fontsize=20)
sage: pp

Some hint ?

lg

Sometimes, the hyphen as subscript doesn't appear : see the A_- in the fragment

sage: pp=  Graphics()
 Graphics()
sage: pp+=text("$A_-$",(0,0),axes=False,fontsize=20)
 pp+=text("$A_-$",(0,0),axes=False,fontsize=20)
sage: pp+=text("$B_-C_+$",(1,0),axes=False,fontsize=20)
 pp+=text("$B_-C_+$",(1,0),axes=False,fontsize=20)
sage: pp
pp