Metamath Proof Explorer


Theorem pell14qrre

Description: A positive Pell solution is a real number. (Contributed by Stefan O'Rear, 18-Sep-2014)

Ref Expression
Assertion pell14qrre D A Pell14QR D A

Proof

Step Hyp Ref Expression
1 pell14qrss1234 D Pell14QR D Pell1234QR D
2 1 sselda D A Pell14QR D A Pell1234QR D
3 pell1234qrre D A Pell1234QR D A
4 2 3 syldan D A Pell14QR D A