Description: Projective subspace sum includes the set union of its arguments. (Contributed by NM, 12-Jan-2012) (New usage is discouraged.)
Ref | Expression | ||
---|---|---|---|
Hypotheses | padd0.a | ||
padd0.p | |||
Assertion | paddunssN |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | padd0.a | ||
2 | padd0.p | ||
3 | ssun1 | ||
4 | eqid | ||
5 | eqid | ||
6 | 4 5 1 2 | paddval | |
7 | 3 6 | sseqtrrid |