pcptradee:
ROWLING (J.K.) Harry Potter and the Philosopher's Stone, FIRST EDITION, FIRST PRINTING, Bloomsbury, 1997, Bloomsbury, 1997
pcptradee:
"What is logically simple is so difficult mathematically". Princeton. Einstein's generalised equations for gravitation. Estimate: >$100,000
pcptradee:
ROWLING (J.K.) Harry Potter and the Philosopher's Stone, FIRST EDITION, FIRST PRINTING, Bloomsbury, 1997, Bloomsbury, 1997