☰ Contents
1.3 · Revisiting irrational numbers
65/101
√2 · step 2: square it
From b
√
2
= a, squaring gives 2b
2
= a
2
. So 2 divides a
2
.
← Previous
√2 · step 1: assume the opposite
Next →
√2 · step 3: so 2 divides a