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- ECHO:TRUE $
- NIND#:2 $ % 2 independent variables X1 = x and X2 = t %
- NDEP#:1 $ % 1 dependent variable U(1) = u %
- DE#:DV#:{} $ % declare DE# and DV# to be arrays %
- DE#[1]: DIF(U(1),X2) - DIF(U(1),X1,2) $ % only one DE this time %
- DV#[1]: U(1,2) $ % and one DeriVative to substitute %
- ECHO:FALSE$
- RDS()$
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