The expression directly below indicator is two cells, dots four six in the first cell and dots two six in the second.
The expression below the sigma is brailled first, followed by the expression above the sigma, and finally the element(s) to the right of the sigma. The Greek capital sigma is formed with three cells, dot six in the first cell, dots four six in the second cell, and dots two three four in the third cell. Braille grouping indicators must be used to enclose an expression that includes more than one item. The scope of a level change indicator is the next item. Some or all of these indicators may be used in sigma notation. The index of the summation appears directly below the sigma and the ending value of the summation is placed directly above the sigma.īraille has four level change indicators: level change up (superscript), level change down (subscript), expression directly above, and expression directly below. The expression is centered around the Greek capital sigma, with the element being summed appearing directly to the right of the sigma. Sigma notation also known as summation notation, is a form of mathematical shorthand for a sum of the values of a variable written as a compact expression. When a complex expression is comprised of a single symbol sequence, a grade 1 word indicator will be enough to ensure that the various indicators are well defined without the need for grade 1 symbol indicators.
When complex algebraic equations contain indicators such as superscript, subscript, fractions, radicals, and/or letters standing alone, it is best to enclose them in grade 1 passage indicators to ensure the symbols are well defined without the need for grade 1 symbol indicators. When grade 1 mode is turned on by the numeric indicator, it is turned off by a space, hyphen, or dash.
Grade 1 mode is turned on by grade 1 indicators and by the numeric indicator.
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