There is no standard symbol for subring
The division symbol is called an obelus (รท) or a division sign. It is used to represent the operation of division in mathematical expressions.
X and y
it is any letter or mathematical symbol that represent a number or a set of number
only one subring of a ring exists
An obelus is a symbol consisting of a short horizontal line with a dot above and below, often used to represent the mathematical operation of division.
In mathematical equations letters of the alphabet are used to represent numbers. Letters in the beginning of the alphabet, a, b, c...,etc typically represent Constants. Letters at the end, x, y, z..typically represent Unknowns, or variables.
What mathematical symbol? Different symbols were invented in different times and places.
I think its this symbol
"why" is not a mathematical symbol.
Delta - Its the fourth letter of the Greek alphabet, and it is often used in mathematical expressions to represent the change (i.e. the delta) that occurs to a value.
Delta as a mathematical symbol usually means "change". It's usually used the same way in physics and chemistry, though it's sometimes used in chemical equations to represent heat.
It's a mathematical metaphor.