mjhjmtu

I define a new command that to number the problems in a chapter:

newcounterproblemNo %problem counter
setcounterproblemNo1 %start at one
newcommandproblem[1]textbfProblem thechapter.
arabicproblemNo #1 parsmallskipstepcounterproblemNonoindent

This code has some indentation problems:

I also tried to use setlengthparindent0cm but with no luck:

newcommandproblem[1]textbfProblem thechapter.arabicproblemNo 
#1 parsmallskipstepcounterproblemNosetlengthparindent0cm 

In fact, now the indent is zero everywhere.

Which is the right way for removing the indentation only after the problem command?

Complete code:

documentclass[12pt,twoside]book

newcounterproblemNo
setcounterproblemNo1
newcommandproblem[1]textbfProblem thechapter.
arabicproblemNo #1 parsmallskipstepcounterproblemNonoindent


begindocument

chapterProblems

problemSolve this problem:
Problem statement.\

problemSolve this problem too:
Problem statement.\


enddocument

Here is an option:

documentclassbook

newcounterproblemNo[chapter]
renewcommandtheproblemNothechapter.arabicproblemNo
newcommandproblem[1]%
 par
 addvspacebigskipamount
 refstepcounterproblemNo%
 noindenttextbfProblem theproblemNo
 #1
 parnobreak
 smallskip
 noindentignorespaces



begindocument

chapterProblems

problemSolve this problem:
Problem statement.

problemSolve this problem too:
Problem statement.

enddocument

What changed:

• Proper definition of problemNo counter to reset with every [chapter] and have a representation that includes the chapter number representation (thechapter).




• A problem starts by adding some space up to bigskipamount.




• The problemNo counter is stepped just before setting Problem X.Y; this allows for proper referencing if you use label-ref.




• After setting the problem statement, a paragraph break is initiated without a possibility for a page break (thanks to nobreak). This avoids having Problem X.Y at the bottom of the page and the problem statement at the top of the following page.

Subsequent paragraphs of a problem statement will have a regular parindent. If you want to avoid this altogether, add setlengthparindent0pt to your preamble.

A completely different approach would be to define your problem as an environment similar to that of a theorem. However, this would require a change in your input.

What about this one?

documentclass[12pt,twoside]book
usepackageamsthm
theoremstyledefinition
newtheoremproblemProblem[chapter]

begindocument

chapterProblems

beginproblem
Solve this problem:\ Problem statement.
endproblem

Text in middle.

beginproblem
Solve this problem:\ Problem statement.
endproblem

beginproblem
Solve this problem:\ Problem statement.
endproblem

enddocument