Coming from the left of a- means…
taking values less than a
The term left of is commonly used to indicate a position on a horizontal or vertical line relative to a given reference point. In the mathematical context, the position of a point on a number line can be described as being to the left or right of a reference point, which is usually denoted as zero.
Therefore, coming from the left of a- means that a point or number is located to the left side of a- on a number line. For example, if a- is located at 3 on the number line, then a point that is to the left of a- could be located at 2 or any number less than 3.
In general, left of is a directional term that is used to describe the position of an object or point relative to a reference point, and it is important to understand the context in which it is being used to correctly interpret its meaning.
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