# How to give subscript in symbols

How can One define subscripts in symbols like phi? If I use this command $\phi$ $_{SB,P}$ It does not come properly. Thanks In this picture the subscript is not clear.

• Combine the subscript with the math term. Also, use upright for terms that are not explicit variables. I might use $\phi_{\mathrm{SB},P}$ if P were a variable, or $\phi_\mathrm{SB,P}$ if it were not. – Steven B. Segletes Feb 11 '16 at 11:13
• Thanks. But the subscript does not come in a very clear manner. – user87834 Feb 11 '16 at 11:26
• Smaller text is harder to read, but the "not clear" problem may just be a screen artifact. It may look perfectly clear on paper. Other options would be to create your document in [12pt] rather than the default 10pt. Finally, a different font choice is also an option. – Steven B. Segletes Feb 11 '16 at 11:30
• Its difficult to create the document in smaller font size. may I know how to reduce the size of particular text. – user87834 Feb 11 '16 at 12:07
• The default document text size can range from 10pt to 12pt, which is invoked with the class, as in \documentclass[12pt]{article}, for example. Once you are in a document, one can temporarily change the font size with macros such as \small, \footnotesize, \scriptsize, and \tiny. There are comparable commands for temporarily making the text larger. You should really consult an introductory book on LaTeX, such as L. Lamport's LaTeX User's Guide & Reference Manual. – Steven B. Segletes Feb 11 '16 at 12:20

\documentclass[12pt]{article}
that are not explicit variables. I might use $\phi_{\mathrm{SB},P}$
if P were a variable, or $\phi_\mathrm{SB,P}$ if it were not.