2 LATEX math constructs abc xyz frac abcxyz overline overrightarrow f0 f abc underlineabc abc overleftarrowabc abc sqrtabc abcc widehatabc zabc overbraceabc n abc sqrtnabc abcf widetildeabc zabc underbraceabc 3 Delimiters b lfloor Uparrow x llcorner. Xn yn zn As you see the way the equations are displayed depends on the delimiter in this case and. To tell the TeX input processor to use the AMS numbering rules where only certain environments produce numbered equations as they would be in LaTeX.
Note that math mode ignores whitespace in fact this whole code could have been put on one line and still would have compiled correctly.
The well known Pythagorean theorem x2 y2 z2 was proved to be invalid for other exponents. Number the equations on the left. These are basically placed on the centre of the page and the equations are important ones that deserve to be. To tell the TeX input processor to use the AMS numbering rules where only certain environments produce numbered equations as they would be in LaTeX.