public SumExpressionList Add(AlgebraExpression expression)
{
return(expression is SumExpressionList
? ExpressionFactory.Sum(this.Terms.Concat((expression as SumExpressionList).Terms).ToImmutableList())
: ExpressionFactory.Add(this, expression)
);
}
public SumExpressionList Subtract(AlgebraExpression expression)
{
return(expression is SumExpressionList
? ExpressionFactory.Sum(this.Terms.Concat((expression as SumExpressionList).Terms.Select(ExpressionFactory.Negate)).ToImmutableList())
: ExpressionFactory.Subtract(this, expression)
);
}
public AlgebraExpression Simplify(ProductExpressionList expression, CancellationToken cancellationToken)
{
var results = expression.Terms
.Select(t => t.AsPower())
.GroupBy(p => p.Base)
.ToList();
if (results.Count != expression.Terms.Count)
{
return(expression.WithTerms(
results
.Select(g =>
ExpressionFactory.Exponentiate(g.Key, ExpressionFactory.Sum(g.Select(p => p.Exponent).ToImmutableList()))
)
.Select(p => exponentSimplifier.Simplify(p, cancellationToken))
.ToImmutableList()
));
}
return(expression);
}
public SumExpressionList WithTerms(IImmutableList <AlgebraExpression> newTerms)
{
return(ExpressionFactory.Sum(newTerms));
}