public boolean updateCoef() { if (ineq != null) { ineq.updateCoef(); // Application.debug(ineq.getType()); return ineq.getType() != Inequality.INEQUALITY_INVALID; } if (left == null && right == null) return false; boolean b = true; if (left != null) b &= left.updateCoef(); if (right != null) b &= right.updateCoef(); // Application.debug("tree" + b); return b; }