真子集不包括原来的集合.
A的子集:Ø,{1},{2},{3},{1,2},{1,3},{2,3},{1,2,3};
A的真子集:Ø,{1},{2},{3},{1,2},{1,3},{2,3};
A的非空子集:{1},{2},{3},{1,2},{1,3},{2,3},{1,2,3};
A的非空真子集:{1},{2},{3},{1,2},{1,3},{2,3}.
希望你能够区分开.
真子集不包括原来的集合.
A的子集:Ø,{1},{2},{3},{1,2},{1,3},{2,3},{1,2,3};
A的真子集:Ø,{1},{2},{3},{1,2},{1,3},{2,3};
A的非空子集:{1},{2},{3},{1,2},{1,3},{2,3},{1,2,3};
A的非空真子集:{1},{2},{3},{1,2},{1,3},{2,3}.
希望你能够区分开.