am­s­text – Type­set text frag­ments in math­e­mat­ics

Part of the AMS-LaTeX dis­tri­bu­tion, this pack­age de­fines a \text macro, which makes it easy to in­cor­po­rate frag­ments of text in­side a dis­played equa­tion or a sub or su­per­script. The font used is the “sur­round­ing text font” and sizes are au­to­mat­i­cally scaled in sub/su­per­scripts.