The structure on the left does not have any resonance contributors in which electrons are. donated to the carbon with the open octet. Compare this with the carbocation that has. resonance and a delocalized positive charge. Charge delocalization imparts stability, so. the structure with resonance is lower in energy.
A numerical expression is a mathematical sentence involving only numbers and one or more operation symbols. Examples of operation symbols are the ones for addition, subtraction, multiplication, and division. They can also be the radical symbol (the square root symbol) or the absolute value symbol.
In a regular expression \d means a digit, and a + means one or more. You want to 'match' one or more numbers in the text. The brackets mean to capture what is found into a number variable-e.g. $1. However, if your text said: And you wanted to know how many balloons you had, the above regular expression wouldn't work.ou want to 'match' one or more numbers in the text. The brackets mean to capture what is found into a number variable-e.g. $1. However, if your text said: And you wanted to know how many balloons you had, the above regular expression wouldn't work.