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The biggest difference between a preimage and the inverse function is that the preimage is a subset of the domain. The inverse (if it exists) is a function between two sets. In that sense they are two very different animals. A set and a function are completely different objects.
On my HP EliteBook the default setting is also that the fn button is inverse (i.e. when you press any of the function keys, like F1 for help or F5 to refresh, then instead of triggering the Funtion-keys, it changes the volume or something random), very annoying. I noticed my fn key can be 'locked' so that it would trigger the f-keys correctly.
Converting. With this formula one can find the amount of pesos equivalent to the dollars inputted for X. The inverse of the function To get the original amount back, or simply calculate the other currency, one must use the inverse function. In this case, the inverse function is: Y=X/2402.9. Were Y is the amount of dollars, and X is the pesos.
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Because you didn't specify the domain and range, assume f is a real function. Also, so the inverse is ...
Inverse of a multivariable function. Ask Question Asked 10 years, 8 months ago. Modified 9 years, 1 month ago.
Inverse modulo function. Ask Question Asked 10 years, 7 months ago. Modified 10 years, 7 months ago ...
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$\begingroup$ @AméricoTavares I usually draw the function in this way eevry time it helps me with composition of functions and when I "play" with algebraic structures but I was always scared to use them in order to explain my concepts in my questions to other people because I believed I was taking too much freedom with a notation that I only saw in cathegory theory, where your sets A,B and C ...
$\begingroup$ 7^29 mod 31 certainly works in this case, but for larger numbers it might be a bit of an effort compared with the Euclidean algorithm, and it would get more complicated by involving Euler's totient function for a non-prime modulus. $\endgroup$ –