Find the inverse element of a given module

edit

Repeating 3 times the same question does not help us to understand what you mean. What is a module ? Give us an example.

Sorry it's my fault, the question was posted twice and I tried Askbot's "merge" button.

@shohruh0905 please add some context, example, explanation, link...

What is meant here by a "module", what does it mean to find its "inverse element"?

Many things are called "module" or "modulus" in mathematics, so it's hard to guess.

What branch of mathematics does this belong to?

Or is it from an applied domain? Electricity? Mechanics? Materials science?

Is it some computation that you know how to do by hand, but wonder how to do with Sage?

Can you provide an example of a simple case? Is there a more complicated case you are stuck with?

If you already defined some objects in Sage, please include the code to define them.

Having a starting point is a great help for anyone who tries to answer a question.

Clarified at

• Ask Sage question 53654