To switch from UEB to music braille when an indicator is necessary, leave a space and place the opening music indicator immediately before the musical notation.

Follow print spacing in any technical notation where spacing is significant. If unsure of its significance, follow the print spacing as long as the presence or absence of spaces is clear. In cases where print spacing is indeterminate or known not to be significant, spacing should be used to reflect the structure of the expression or equation.

Note: In most common mathematics including algebra, operation signs should be unspaced on both sides but comparison signs should be spaced.

Refer to: Guidelines for Technical Material, Part 1, General Principles, for more advice on the spacing of technical material.

Follow the provisions of New International Manual of Braille Music Notation for returning to UEB from music braille.

When technical material is transcribed according to the provisions of The Nemeth Braille Code for Mathematics and Science Notation within UEB text, the following sections provide for switching between UEB and Nemeth Code.

A simple numeric fraction is one whose numerator and denominator contain only digits, decimal points, commas or separator spaces and whose fraction line in print is drawn between the two vertically (or nearly vertically) arranged numbers. In such a case a numeric fraction line symbol is used between the numerator and denominator and continues the numeric mode.

Place the opening Nemeth Code indicator followed by space before the sequence to which it applies. Its effect is terminated by the Nemeth Code terminator preceded by space. 

Note: The spaces required with the indicator and terminator do not represent spaces in print.

Mixed numbers should be treated as two unspaced numeric items.

When the Nemeth Code text is displayed on one or more lines separate from the UEB text, the opening Nemeth Code indicator and the Nemeth Code terminator may each be placed on a line by itself.

The numeric fraction line is not used when the print is expressed linearly using an ordinary forward slash symbol. In such a case the same symbol is used as in print.

If the numerator or denominator is not entirely numeric as defined in 11.3.1, then the general fraction indicators should be used. Write the opening indicator, then the numerator expression, then the general fraction line symbol, then the denominator expression and finally the closing indicator.

Note: If an opening or closing fraction indicator appears within a grade 2 passage, it may need a grade 1 indicator.

Note: Both numerator and denominator may be any kind of expression whatever, including fractions of either simple numeric or general type.

Refer to: Guidelines for Technical Material, Parts 6.4 and 6.5, for more examples of general fractions.