What word can I use as opposite of trapping?

I am trying to describe a region of a random walk on a graph (don’t worry if you don’t know what it is, visualise it as a physical space, e.g. a park). This graph has a part that if you go there, you cannot leave. I named this part “trapping”.

I am trying to find a word for the other part, the one you can freely roam around but once you leave, you cannot come back. I thought of repelling, but repelling implies an action, that the part tries to get rid of you. I cannot find anything that fits here. Do you have any suggestions?

I’m also happy to change trapping to something else of it makes it easier to find an antonym.

Edit: This is for a paper I’m writing that has to do with random walks on a graph. I didn’t want to scare people off with mathematical lingo, so I talked about physical space.

Answer

As I have no references to include I originally posted this as a comment but the OP has asked me to post it as an answer.

The phrase ‘lock-out area’ might be appropriate, particularly if you renamed the ‘trapping’ area the ‘lock in’ area.

This works because there is an analogy to leaving a building with an automatic lock without having a key to the lock or shutting your keys in a vehicle with an automatic lock.

There is also the analogy of labour disputes where employers have been known to ‘lock out’ employees who are taking industrial action short of striking (a lock out) or where employees have occupied a workplace and refused to leave (a lock in).

Attribution
Source : Link , Question Author : tst , Answer Author : BoldBen

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