Mathematical equality Memes

The mathematical joke here is absolutely brilliant! The meme shows the "Top 9 Math Subreddits" as happy and the "10th Largest Math Sub" as horrified - because the 10th place is equivalent to being at position 0.999... which mathematically equals 1! So the 10th sub is actually tied with the 1st place sub, but doesn't realize it yet. This plays on the infamous mathematical proof that 0.999... = 1, which causes endless flame wars in math communities. The sub claiming they're different is literally ranked in a position that proves they're the same!