# delta system

If $S$ is a set of finite sets^{} then it is a *$\mathrm{\Delta}$-system* if there is some (possibly empty) $X$ such that for any $a,b\in S$, if $a\ne b$ then $a\cap b=X$.

Title | delta system |
---|---|

Canonical name | DeltaSystem |

Date of creation | 2013-03-22 12:54:57 |

Last modified on | 2013-03-22 12:54:57 |

Owner | Henry (455) |

Last modified by | Henry (455) |

Numerical id | 5 |

Author | Henry (455) |

Entry type | Definition |

Classification | msc 03E99 |

Related topic | DeltaSystemLemma |