Pulmochart Reference Describes the rules for the '<=' sign.

# Less than or equal to (<=)

## Overview

Use the symbol
`<=`
to notate the inequality 'less than or equal to'.

For example:

A <= B

means:

A is less than or equal to B

## Details

The expressions a and b in the inequality a <= b should be substituted by any of the following:
- a fixed text string, for example hypertension
- a fixed numerical value, for example 12.3, also valid is 12,3
- a global variable, for example \$hour\$
- any other variable or variable parameter, for example \$Design.Constant 1.Value\$, or \$LastName\$.

Variables are substituted by their current values at the time the inequality is processed. Spaces around the expressions are trimmed automatically.

The way the inequality is solved depends on the type of its expressions:

Both expressions are numbers
The inequality is handled according to numerical rules.

Both expressions are textual
If a text string is to be compared to another text string, then comparison is handled in an ordinal fashion like is used for alphabetic (lexical) sorting.
For example:
a <= b evaluates to TRUE, because the letter b lexically follows on the letter a.
a <= a evaluates to TRUE
Peter <= Pete evaluates to FALSE, because lexically Peter follows on Pete.
HELLO <= hello evaluates to TRUE, because capitals are listed before non-capitals.
a10 <= a2 evaluates to TRUE, because the character 1 is listed before the character 2 (!).

One of both expressions is textual, the other is a number
If one of both expressions is a text, then the other expression is also handled like text.