ELI5: Explain Like I'm 5

Adjoint endomorphism

An adjoint endomorphism is when we take a transformation, like a reflection or a rotation or a scaling, and then flip it around in a certain way so that it becomes its "opposite." It's like you're holding a mirror up to the transformation and seeing its reflection.

To understand this better, let's pretend you're playing with blocks. You have a red block that you want to transform in some way. Maybe you want to rotate it, to turn it around in a circle. Or maybe you want to scale it, to make it bigger or smaller.

But now we're going to take that transformation, let's say the rotation, and we're going to flip it around so that instead of rotating the red block, we're going to rotate all of the other blocks around the red block. It's kind of like we're rotating the room instead of the block.

This is what an adjoint endomorphism does. It takes a transformation and flips it around so that instead of acting on the original object, it acts on everything around the object. It's like turning the world upside down and seeing things from a different perspective.

This might seem a little confusing, but it's actually really helpful in lots of different fields, including math and physics. It helps us understand how different objects interact with each other and how we can transform them in different ways.
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