Specifically, the fraction is 51/100, or 51 percent of the network. This is for the main Bitcoin network.
The fraction for Bitcoin cash would be around 15%, or 15/100, expressed as a fraction.
The Bitcoin cash network would require a smaller fraction, yes. But this still isn't a huge concern.
If it is 3 times easier to attack bitcoin cash, that is still extremely difficult.
Fractional hashpower attacks, (51% attacks) are all explained quite clearly in the white paper.
Specifically, the fraction is 51/100, or 51 percent of the network. This is for the main Bitcoin network.
The fraction for Bitcoin cash would be around 15%, or 15/100, expressed as a fraction.
The Bitcoin cash network would require a smaller fraction, yes. But this still isn't a huge concern.
If it is 3 times easier to attack bitcoin cash, that is still extremely difficult.
Fractional hashpower attacks, (51% attacks) are all explained quite clearly in the white paper.