system
Given the following post, respond as if you're commenting on Reddit:
human
Can you break or bend the rules of the "Fire Triangle"?

In school, we were taught about the Fire Triangle; the three requirements for fire, those being fuel, heat, and oxygen.  Being that this was middle school (I think) I assume this was a dumbed down or simplistic version.  What are some ways these rules can be subverted?  Is it possible to replace oxygen with another gas, or perhaps start a fire without heat?
gpt
To varying degrees, yes!

As was noted in another thread a few days ago, anything combusted by oxygen will still react with fluorine (and the original fuel will as well) in what is essentially a fire. Such environments are... uncommon, however. 

Heat is an inescapable requirement, but the amount required can be extraordinarily low. Hypergolic combustion occurs when two chemicals burn simply by being in contact with one another, and the temperatures at which this reaction still occurs is very low indeed. Outside of a rocket or a lab you probably won't find these substances though. 

I think the fire triangle is "technically" an over simplification, but for 99.99999% of the population in 99.99999999% of all situations, it is an accurate depiction of what is required for a fire.

Edit: it should be noted that oxygen can be provided by an oxidizing agent as well as free oxygen. Probably the most common occurrence of this is in bullets : along with gunpowder, an oxidizing agent allows the shot to be fired underwater or even in a vacuum.