== Math notation conventions == 

 Please.  Read Wikipedia:Manual of Style (mathematics).  There is a difference between the following two things: 
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 : |m-n| = 3k+1 or 3k-1. 
 : |m − n| = 3k + 1 or 3k − 1. 
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 In non-TeX mathematical notation like this, variables (but NOT digits and not punctuation) are to be italicized; a minus sign is not a mere hyphen; and spaces preceed and follow plus or minus signs and the like. 
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 Also, "displayed" TeX is indented by an initial hyphen; thus the second of the following is right: 
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 Also, note that the title phrase should be set in bold at its first appearance (see WP:MOS).