Then that's redefining what the 11 is.
"Then that's redefining what the 11 is."
Nope. It's not. The article said that 2+2=4. It does, in several number bases. It does not equal 4 in base 3. Without defining the number system you are using, such statements are false.
As several people noticed, 2+2=11 ONLY in base 3, but the sum is correct as written. Since the number base was not defined in the first example, I have changed nothing about the definition. I simply used a different base and came up with a different answer.
The article said that 2+2=4 always. That is clearly not true.
Now, I do not know of a practical use for Base 3 math, although they may be one, if there is a physical system somewhere that has three states.