Question Number 164748 by ajfour last updated on 21/Jan/22
Commented by mr W last updated on 21/Jan/22
$${is}\:{it}\:{not}\:{always}\:{ok}\:{for}\:{any}\:{a}\:{and}\:{b} \\ $$$${with}\:{b}={a}+\mathrm{1}? \\ $$
Commented by ajfour last updated on 21/Jan/22
$${yes}\:{sir},\:{you}\:{are}\:{right}! \\ $$