1. Here is a model:

Domain: {Wikipedia, 2, Isaac Newton}

Referents: n: Isaac Newton

Extensions: P: Q: {2} R: {Wikipedia, Isaac Newton}

Is the following proposition true or false on this model? Explain your answer.

x(Qx Rx) Pn

2. Is the following argument valid or invalid? If it is valid, explain why there cannot be a countermodel. If it is invalid, provide a countermodel.

xHx

xMx

x(Mx Hx)