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Michael_Light
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Michael_Light said:View attachment 35474 such that x is real number and x =< 3
No, "[itex]y= \sqrt{3- x}[/itex]" is an equation but the additional "such that x is a real number and [itex]x\le 3[/itex]" states a domain and makes this a function.g_edgar said:Actually, it is an equation, not a function. This equation can be used to define a function by someone who knows what he is doing.
Where did you get that idea? The original function happens to be one to one but that was irrelevant to the question and to the responses.blather said:For clarification, we're talking about "one to one" functions.
Where did you get that idea? The original function happens to be one to one but that was irrelevant to the question and to the responses.
blather said:Restricting the domain to pass the vertical line test doesn't need to happen to define it as a function...just a one-to-one function.
you can call it some sort of " general mapping" from a set A to a set B, but it may not be well-defined.
blather said:It's the "general math" forum! The answer should be general!
;-)
A function is a mathematical concept that describes a relationship between two or more variables. It takes in one or more input values and produces an output value based on a specific rule or formula.
A function must have a unique output for every input, meaning that each input value can only produce one output value. It must also be defined for all possible input values and have a clear rule or formula for determining the output.
To determine if something is a function, you can use the vertical line test. This involves drawing a vertical line through the graph of the relationship. If the line intersects the graph in more than one point, then it is not a function. If the line intersects the graph in only one point, then it is a function.
A relation is a set of ordered pairs that describe a relationship between two or more variables. A function is a type of relation that has the additional characteristic of each input value having only one output value. In other words, a function is a type of relation that passes the vertical line test.
No, a function cannot have more than one input value for the same output value. This would violate the rule that each input value must have a unique output value. However, multiple input values can produce the same output value.