If you enter ym xthen LaTeX ignores the space and in the output the m is next to the x. Letters are printed in italics with more space left in-between spaces are ignored. Mathematical expressions that are given in a line are known as expressions.
If you enter ym xthen LaTeX ignores the space and in the output the m is next to the x.
For producing an inline expression the math expression should be written between the dollar sign. Again use to toggle the equation numbering. The font type LaTeX uses in math mode is somewhat special since it is optimized for writing mathematical formulas. An operator is a function that is written as a word.