- #1
NotASmurf
- 150
- 2
lim 1/x as x->0 is infinity, but the function taking it to infinity is continuous, but for continuous functions f(a)= lim f(x) as x->a, so by defininition 1/0 is infinity, what is wrong with this logic?
Yeah, sorry. I realized and edited my post. You replied just before I finished.NotASmurf said:a is 0, f=1/x
is not true. The left and right limits are not the same.lim 1/x as x->0 is infinity
pwsnafu said:Also, I want to point out
is not true. The left and right limits are not the same.
No.The limit from the left is ##-\infty##. For example ##1/(-.01) = -100##NotASmurf said:Why not? 1/x coming from the negative side to 0 should yield same result as from the positive?
There is no way to extend the definition of f to x=0 in a continuous way.NotASmurf said:but for continuous functions f(a)= lim f(x) as x->a
Take a look at the graph of y = 1/x. There is the worst possible kind of discontinuity at x = 0, with ##\lim_{x \to 0^-} \frac 1 x = -\infty## and ##\lim_{x \to 0^+} \frac 1 x = +\infty##.NotASmurf said:lim 1/x as x->0 is infinity, but the function taking it to infinity is continuous, but for continuous functions f(a)= lim f(x) as x->a, so by defininition 1/0 is infinity, what is wrong with this logic?
The continuity definition of 1/0 is a mathematical concept that states that when a function approaches a value of 1/0, the limit of the function is infinity.
By the continuity definition, when a function approaches a value of 1/0, its limit becomes unbounded and thus is considered infinity.
No, 1/0 is not actually equal to infinity. It is only considered infinity by the continuity definition, as it represents an unbounded limit of a function.
The continuity definition of 1/0 is commonly used in calculus and other mathematical fields to analyze the behavior of functions at certain points, such as in limits and derivatives. It also has applications in physics and engineering, where it is used to model and solve various problems.
No, the continuity definition of 1/0 cannot be applied to all functions. It only applies to certain types of functions, such as continuous functions, and does not hold for functions that are undefined or discontinuous at a certain point, such as at 1/0.