one plus one is two?

This morning when I came here, the road was so slithery that I almost could not stand steady. I took every step carefully but hardly to keep my balance.
But after I met a friend who though had fell over several times, the magic happened. We held our arms across arms, and we felt that the slippery ice under our feet is no longer naughty.
That is one plus one. Absolutely,the combineded strength is much more than that of the two individuals itself!
Well, it is certain that one and one are equal two mathematically. Yet one plus one is more than two in our life. Why? It has an plus sign between them, and the sign does not only means combination, but the cooperation, communication and connection.
When true lovers meet, for example, does their combination just mean two simple person? No, it means a family, and a family means generations of people, means endless love and responsibility. Furthermore, it could mean a historical family business, like Jiachen Li's,Ro