#"Positive", "Negative", "Non-Negative", "Non-Positive"

Positive, by default, means strictly positive, ie. all N larger than zero. Zero is not a positive number.

Negative means all N less than zero. Zero is not a negative number.

Non-negative means all N larger than or equal to zero. Zero is a non-negative number.

Non-Positive means all N smaller than or equal to zero. Zero is a non-positive number.

"Positive", "Negative", "Non-Negative", "Non-Positive"

Positive, by default, means strictly positive, ie. all N larger than zero. Zero is not a positive number.

Negative means all N less than zero. Zero is not a negative number.

Non-negative means all N larger than or equal to zero. Zero is a non-negative number.

Non-Positive means all N smaller than or equal to zero. Zero is a non-positive number.

#"Positive", "Negative" and "Non-Negative"

Positive, by default, means strictly positive, ie. all N larger than zero. Zero is not a positive number.

Negative means all N less than zero. Zero is not a negative number.

Non-negative means all N larger than or equal to zero. Zero is a non-negative number.

#"Positive", "Negative", "Non-Negative", "Non-Positive"

Positive, by default, means strictly positive, ie. all N larger than zero. Zero is not a positive number.

Negative means all N less than zero. Zero is not a negative number.

Non-negative means all N larger than or equal to zero. Zero is a non-negative number.

Non-Positive means all N smaller than or equal to zero. Zero is a non-positive number.