How about this?
2 matchsticks - I removed one matchstick to get a minus, and rotated another one to get an equals sign. If you want, the removed matchstick can be placed anywhere to double a line.
$$\int x \, dx - \frac{x^2}2 = C$$
How about this?
2 matchsticks - I removed one matchstick and rotated another one. If you want, the removed matchstick can be placed anywhere to double a line.
$$\int x \, dx - \frac{x^2}2 = C$$
How about this?
2 matchsticks - I removed one matchstick to get a minus, and rotated another one to get an equals sign. If you want, the removed matchstick can be placed anywhere to double a line.
$$\int x \, dx - \frac{x^2}2 = C$$
How about this?
2 matchsticks - I removed one matchstick and rotated another one. If you want, the removed matchstick can be placed anywhere to double a line.
$$\int x \, dx - \frac{x^2}2 = C$$