Questions tagged [reverse-math]

Reverse mathematics is the study of which axioms are required to prove mathematical theorems. This study is carried out by using formal theories of arithmetic, particularly subsystems of second-order arithmetic. Similar results in the context of set theory, for example those related to the axiom of choice and ZF set theory, should use the set-theory tag instead, possibly in combination with the axiom-of-choice tag.

128 questions
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Getting formula based on graph

I've got a graph image, but I need the formula used the create this graph. This image is being used to read the result corresponding values manually, but I want to automate this by using a formula. The X axis is a known value 'som van de faktoren',…
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getting the initial number from the end total

i would need some advice if it is possible to get the initial number from a total number. I am trying to create a level system in my application and i need from the total experience to find the current experience level. level 1 require 10 to…
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How can i figure out an algorithm by comparing input and output?

I have a bunch of input numbers and output numbers that were run through an algorithm that I don't know. What is the approach for discovering the algorithm that generated the outputs? I assume this is possible by comparing the input to the output,…