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#once #create message .ND .tr %$ .EQ delim $$ .EN .LP The next topic goes back to the problem of formatting equations on the page. Sometimes it is desirable to line up one part of an equation with so

#once #create message .ND .tr %$ .EQ delim $$ .EN .LP We have introduced a fair number of "magic" words like sub and sup and over and pi and sum. What happens if you need to print an equation that co

#once #create message .ND .EQ delim $$ .EN .LP The next neqn word to learn is "over", which makes fractions like .EQ a+b over c .EN In fact that line was made by .EQ a+b over c .EN To begin w

#once #create message .ND .LP The next neqn operation is called "sqrt" - it makes square root signs over things, like this: .EQ sqrt a+b .EN (They don't look very good on a terminal, unfortunately.) T

#once #create message .ND .tr %$ .EQ delim $$ .EN .LP The next step is to learn how to put big parentheses, brackets, braces or bars around equations, like this: .EQ left | a sup 2 over b sub i right

#print Although specifying lines by line number is easy to understand, it is hard to do in a long file. You will therefore want to learn other ways of addressing lines. The 'current line' is address

#print Is there just as easy a way of printing the immediately preceding line? Not quite, but almost. The line - will print the line just before the line you are on. What's the equivalent command

#print A command related to the 'g' command is the 'v' command. The 'v' command also selects lines on which another command is to be executed; the difference between 'g' and 'v' is that the 'v' comm

#print The most frequently used editor command is p which prints out a line. Try that now. Type the command sequence p w q to print out a line, and then write out the file. Then type "ready". #cr

#print The "*" character is also used in substitute commands, but it has a different meaning. Here it means "any number of repetitions of the previous character". (including zero!). Thus a* is any