Leibniz's Principle of Sufficient Reason, when applied within actualist realism, entails that every contingent fact must have a fully determining cause, leaving no explanatory room for genuinely contingent outcomes.

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Contingent fact(contrasting with tautological features that don't require explanation): Something that happens to be true in the real world but could have been otherwise—the opposite of something that must be true by definition.
Fully determining cause(as what the Principle of Sufficient Reason requires): A cause that completely and necessarily makes something happen, leaving no possibility for it to turn out differently.
Genuinely contingent outcomes(as what the statement says cannot exist under this principle): Results or events that truly could have happened differently, with no complete explanation forcing them to occur one way rather than another.
Leibniz: Leibniz is a German philosopher and mathematician from the 1600s-1700s who developed calculus (a powerful math tool for measuring change and areas) independently around the same time as Isaac Newton. He's famous for creating much of the notation we still use in mathematics today and for arguing that everything in the universe follows logical principles. His ideas profoundly influenced modern science, mathematics, and philosophy, making him one of history's most important thinkers.

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