Z-R mean when you plug in an integer you will get back a real number. Commonly is used to mean multiplication when handwritten or used on a calculator 2 2 for example. 9This symbol means there exists.
The following list of mathematical symbols by subject features a selection of the most common symbols used in modern mathematical notation within formulas grouped by mathematical topic.
For example a unicorn. The following list of mathematical symbols by subject features a selection of the most common symbols used in modern mathematical notation within formulas grouped by mathematical topic. List of all mathematical symbols and signs - meaning and examples. So writing xR means x is an element of R where R written in blackboard bold means the set of real numbers.