There is proof that 1-1+1-1+1-1....= 1/2. A simple google search will show you that this is Grandi's series and it is accepted to be 1/2. Proof is everywhere to be found. It's not a "magician's trick".

## Proof

There is proof that 1-1+1-1+1-1....= 1/2. A simple google search will show you that this is Grandi's series and it is accepted to be 1/2. Proof is everywhere to be found. It's not a "magician's trick".