Formula language

2, -4, 0.5	Number
$<NUMBER>	Cell, absolute address
$-<NUMBER> $+<NUMBER>	Cell, relative address
+, -, *, /, <, >, =, ~=	Mathematical and logical operations
ifelse(condition, valueA, valueB)	IfElse function

Examples

2 + 2
$0 + $1 * 3
($-1 + 1)*$5
if($5 < $6, $6, $5)