# Error in false statement

Hello

I write in SAGE the following

```
p=0+0*I
q=1/2+1/2*I
r=3/4+1/3*I
(real(p)==real(q))==false
```

and it returns "false", but it is true because 0 is not equal to 1/2. Why?

Error in false statement

Hello

I write in SAGE the following

```
p=0+0*I
q=1/2+1/2*I
r=3/4+1/3*I
(real(p)==real(q))==false
```

and it returns "false", but it is true because 0 is not equal to 1/2. Why?

add a comment

1

The operation

```
real(p) == real(q)
```

creates an "inequality". As you can check, the output prints as

```
>> real(p) == real(q)
0 == (1/2)
```

You know that the above is false but it is not automatically evaluated within Sage. If you want to force the evaluation you need to run

```
>>> bool(real(p) == real(q))
False
```

Please start posting anonymously - your entry will be published after you log in or create a new account.

Asked: ** 2019-03-03 17:10:55 +0100 **

Seen: **114 times**

Last updated: **Mar 03 '19**

Copyright Sage, 2010. Some rights reserved under creative commons license. Content on this site is licensed under a Creative Commons Attribution Share Alike 3.0 license.