4x lower is so mathematically awkward.

That reads fine to me as a native-ish English speaker. What would read less awkward for you?

Like a comment on another thread, 0.25x would be the much better way to say this. It's 25% of the original value. It's also consistent: If 3x means 300% the original value, then 0.25x is 25% of the original value.

If you say 4x lower, that changes the semantics for lower than x vs higher than x, which is absurd.

> If you say 4x lower, that changes the semantics for lower than x vs higher than x, which is absurd.

where does it say in the rulebook that human languages have to have perfectly symmetric pairs of words?

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Whatever happens, surely we can unite against the Crazed Barbarians who use percentages. :)

So like, -3x?

More like 0.25x.