Educational notes

• The [latex]\sqrt{\hphantom{9}}[/latex] symbol is also called a "radical", but has no meaning on its own.
• The [latex]\sqrt{\hphantom{9}}[/latex] symbol is read as "radical" or "positive square root of..."
• In the expression [latex]\sqrt[n]{\hphantom{9}}[/latex], the number [latex]n[/latex] is called the index of the radical; the expression is called a radical of order [latex]n[/latex]. The horizontal bar that groups the radicand is called the vinculum.
• Similar radicals are radicals with the same index or the same order.
• Christoff Rudolff is credited with having introduced the radical symbol.