# Relations

Many relation symbols are typed in Nemeth using two or more braille cells. The equation editor will supply the proper relation symbol once you have completed it.

When typing symbols that use more than one braille cell, the equation editor may supply an intermediate symbol that represents the braille you have typed so far. For example, when you type the equal sign, the equation editor will first treat dots 46 as a decimal point, and then change it to an equal sign when you next type dots 13.

The equation editor will supply spaces around signs of comparison for you, and you need not type them. Whether you type them or not, however, the equation editor should produce the proper Nemeth braille output.

When typing a number after a sign of comparison, you may type a space in between, or you may choose not to. Whether you type the space or not, the equation editor should produce the proper Nemeth braille output. The only exception is that when typing a greater than sign (dots 46 dot 2) after a number, you must type a space in between to indicate that dots 46 should not be treated as a decimal point.

## Exercises

Type the following expressions into the equation editor below and verify that the equation editor produces the proper Nemeth braille output in each case. Also verify that a sighted friend can read each expression you have typed as it is displayed on the screen. Feel free to try your own examples, and to explore other less common signs of comparison.

• 3 + 4 = 7
• 2 + 3 < 2 * 3
• 22 / 7 > 3.14
• x + y <= x * y
• x * y >= x + y