Description: A square of a real is nonnegative. (Contributed by NM, 3-Aug-1999)
Ref | Expression | ||
---|---|---|---|
Hypothesis | resqcl.1 | |
|
Assertion | sqge0i | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | resqcl.1 | |
|
2 | 1 | msqge0i | |
3 | 1 | recni | |
4 | 3 | sqvali | |
5 | 2 4 | breqtrri | |