Update programming.md

docs/source/programming.md

@@ -44,7 +44,7 @@ $$i\frac{d\left|\Psi\right>(t)}{dt} = \frac{H(t)}{\hbar} \left|\Psi\right>(t)$$
 
 Here $H(t)$ is the Hamiltonian describing the evolution of the system. For a system of atoms in the initial state $\left|\Psi_0\right>$, the final state of the system after a time $\Delta t$ is:
 
-$$ \left|\Psi_f\right> = \exp\left(-\frac{i}{\hbar}\int_0^{\Delta t} H(t) dt\right)\left|\Psi_0\right>$$
+$$ \left|\Psi_f\right> = \mathcal{T}\exp\left(-\frac{i}{\hbar}\int_0^{\Delta t} H(t) dt\right)\left|\Psi_0\right>$$
 
 :::{tip}
 The equation below uses the [Indexed Operator](conventions.md#indexed-operator) notation.
@@ -252,4 +252,4 @@ Many concepts have been introduced here and you might want further explanations.
 - The `Device` object contains all the constraints and physical quantities that are defined in a QPU. [This section in the fundamentals](./hardware.ipynb) details these and provides examples of `Devices`. The `VirtualDevices` were also mentioned in this document ([here](programming.md#1-pick-a-device)), which is a more advanced feature described [here](tutorials/virtual_devices.nblink).
 - There are multiple ways of defining a `Register`, as is further detailed [in this section](tutorials/reg_layouts.nblink).
 - The energy levels associated with each `Channel` and the interaction Hamiltonian they implement are summed up in [the conventions page](conventions.md). The channels contain lots of constraints and physical informations, they are detailed in [the same section as the `Device`](./hardware.ipynb).
-- The quantities in a `Pulse` are defined using `Waveform`s, you can read more about these [on this page](tutorials/composite_wfs.nblink).
+- The quantities in a `Pulse` are defined using `Waveform`s, you can read more about these [on this page](tutorials/composite_wfs.nblink).