Residual connections add a sublayer output back to its input. The example here is exact vector addition, recomputed from displayed integers and kept separate from named components.
highlighted = computed this step
Residual connections
A residual connection adds a sublayer output back to its input. The rule is exact vector addition: output equals sublayer of x plus x. This direct add is one of the block pieces that stays fully in the exact register.
out=sublayer(x)+x
Exact residual add
Here the input vector is (2,3) and the sublayer vector is (1,-1). Their exact sum is (3,2). Each coordinate is recomputed from the displayed vectors, so the residual example has no hidden source.
(2,3)+(1,−1)=(3,2)
Summary
The residual add keeps a direct path through the block, and the add itself is exact. No transcendental operation appears in this step; the named boundaries come from other components.