Even if you give me the whole world, I will only be by your side.
2. Heart-shaped line
There is a formula in a letter Descartes sent to the princess, and that formula is just a heart.
I used to know this formula and figure, but I couldn't draw it. Recently, I reviewed advanced mathematics, and the teacher spoke it very well. I just know that the heart-shaped line is so easy to draw, and Descartes' love is so simple and pure.
On this road, I will stick to it, for myself and for the romance in mathematics.
Good night and sweet dreams.