Show minimum of all values in a series

[alan_grn]

I have a chart which show balances for each day. The expression is claculatio as below :

SUM

I now want anotehr series whihc takes the minimum value of the series above. i.e. the minimun of the sum for each day.

({$<[Business Date]={$(='"<='&DATE(MAX([Business Date]))&'"')}>} [Cr Balance])