Description: If there is an untangled element of a class, then the intersection of the class is untangled. (Contributed by Scott Fenton, 1-Mar-2011)
Ref | Expression | ||
---|---|---|---|
Assertion | untint |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | intss1 | ||
2 | ssralv | ||
3 | 1 2 | syl | |
4 | 3 | rexlimiv |