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+digraph {

+greek[fontname=Symbol label="αβγδεζηθικλμνξοπρςστυφχψωϒϖ"

+];

+subgraph {

+a[ fontname=Symbol label="for all: ∀"];

+b[ fontname=Symbol label="part: ∂"];

+c[ fontname=Symbol label="exists: ∃"];

+d[ fontname=Symbol label="empty: ∅"];

+e[ fontname=Symbol label="nabla: ∇"];

+f[ fontname=Symbol label="isin: ∈"];

+g[ fontname=Symbol label="notin: ∉"];

+a->b->c->d->e->f->g;

+};

+subgraph {

+i[ fontname=Symbol label="ni: ∋"];

+j[ fontname=Symbol label="prod: ∏"];

+k[ fontname=Symbol label="sum: ∑"];

+l[ fontname=Symbol label="lowast: ∗"];

+m[ fontname=Symbol label="square root: √"];

+n[ fontname=Symbol label="proportional to: ∝"];

+o[ fontname=Symbol label="infinity∞"];

+i->j->k->l->m->n->o

+};

+greek->a

+greek->i

+}

+