# What is the math sign for undefined?

The mathematical symbol for "undefined" is the infinity symbol.

### What does it mean when a math problem is undefined?

When a math problem's answer is "undefined", that means that it's an impossible answer, such as 3/0. A number can't be divided by zero because 3/0, as a word problem, would be, "How many times does zero go into three?" Since there is no real answer, they just call it undefined. Note that it can only happen with division problems, and not multiplication, addition or subtraction problems, since 3*0 is 0, 3+0 is 3 and…

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### Is undefined the same thing as not a real number?

Yes, I do believe that those are the same things. I have a long-lasting history in math and when my students ask me this question, I am always positive that, in math, these two terms can mean the same thing in different instances. For example, if a number is not a real number, it can be undefined as well (and vice versa). If someone came up to me and asked me this exact question, I…

### What is the definition of the word undefined?

The term 'undefined' means not precisely limited, determined, or distinguished not precisely limited, determined, or distinguished; "an undefined term"; "undefined authority"; "some undefinenot precisely limited, determined, or distinguished; "an undefined term"; "undefined authority"; "some undefine

### What does expression mean in math?

In math expression means when you have a number sentence without an equal sign. A mathematical or algebraic expression is a collection of terms that do not include an equality sign because it is not an equation. A mathematical or algebraic expression is a collection of terms that do not include an equality sign because it is not an equation.