| ∀ ax1, fs. new(ax + ax1, fs) ↔ new(ax, fs) ∧ new(ax1, fs) ⊦ new(ax + ax1, fs) ↔ new(ax, fs) ∧ new(ax1, fs), new(ax + ax1, fs), adr ∈ fs |
new(ax, fs), new(ax1, fs), ∀ ax1, fs. new(ax + ax1, fs) ↔ new(ax, fs) ∧ new(ax1, fs) ⊦ new(ax + ax1, fs), adr ∈ fs