There is a chalkboard at MIT that remembers him. Sixty years of equations, proofs, and carefully constructed examples worn into its surface like grooves in an old vinyl record. The man who stood before it for six decades understood something that many educators miss: mathematics is not a spectator sport. You learn it by doing, by struggling, by having someone patient enough to wait while you figure out why the minus sign matters.
Gilbert Strang joined MIT's mathematics faculty in 1962. He taught there for more than six decades before retiring in 2023, one of the longest active teaching careers in the institute's history. Over that time, he taught thousands of students in person and many more remotely. His flagship course, 18.06 Linear Algebra, became a defining part of MIT's undergraduate curriculum and, eventually, a cornerstone of how the world learns the mathematics that powers modern artificial intelligence. What began as an undergraduate classroom course gradually grew into something larger: a global learning resource available to anyone with an internet connection.
The Mathematics Behind the Machine
Linear algebra is the branch of mathematics dealing with vectors, matrices, and systems of linear equations. On paper, it sounds abstract a collection of symbols and rules to memorize and forget by finals week. In practice, it is the engine underneath nearly every major technology that defines contemporary life.
Neural networks, the systems that power modern AI applications, rely on matrix multiplications to pass data through layers. Machine learning models use vectors to represent data points and features. Eigenvalues and eigenvectors power dimensionality reduction techniques like PCA. Singular Value Decomposition, known as SVD, is used in recommendation systems, image compression, and natural language processing. Without a solid grasp of linear algebra, understanding how a model learns, generalizes, or fails is nearly impossible.
Strang's course gave learners exactly that foundation. Through BreezyScroll's profile of his career, the scope becomes clear: he wasn't just teaching a math class. He was teaching the language that machines would later speak.
The Chalkboard Philosophy
Most mathematics courses start with definitions, theorems, and proofs and leave students drowning in abstraction before they've built any intuition for why the material matters. Strang did the opposite. He started with concrete examples, letting students feel why an idea worked before formalizing it. This wasn't a minor stylistic quirk. It was a pedagogical philosophy, and it explains why learners who struggled with math in traditional classroom settings often found themselves actually understanding it through his lectures.
He avoided the word "obvious" a small but telling choice that signals how much he respected the learner's experience. He paused regularly to check understanding, treating a first-year undergraduate the same way he'd treat a doctoral student: with patience and seriousness. He believed that clarity was not a compromise with rigor but rather its precondition. If a concept couldn't be explained simply, perhaps it wasn't fully understood.
His textbook, Introduction to Linear Algebra, has been adopted by universities across engineering, computer science, and mathematics programs worldwide. It isn't just widely used it helped standardize how the subject is taught globally. The book reflects the same philosophy as his lectures: build intuition first, formalize second.
Opening the Doors
In 2001, at the dawn of the digital age, MIT made a decision that would reshape the landscape of global education. The institute launched an initiative to open its curriculum to the world: MIT OpenCourseWare, publishing course materials online for free, available to anyone with an internet connection. While some educators were cautious about sharing their lectures publicly, potentially diluting the value of a university education or exposing themselves to criticism, Strang supported the idea from the outset.
He recorded and released his full course, including lecture videos, assignments, exams, and detailed solutions. This decision transformed a traditional university course into something else entirely a global educational resource. Students in Lagos and London could watch the same lectures as undergraduates in Cambridge, Massachusetts.
"When MIT opens its doors, the world walks in," said Dimitris Bertsimas, vice provost for open learning, at OpenCourseWare's recent 25th Anniversary Symposium. "Twenty-five years ago, MIT made a bet on openness, generosity, and on the belief that knowledge is a public good. That bet has paid off 500 million times over."
"Twenty-five years ago, MIT made a bet on openness, generosity, and on the belief that knowledge is a public good. That bet has paid off 500 million times over."
Dimitris Bertsimas, Vice Provost for Open Learning, MIT
According to MIT News's coverage of the anniversary, that impact crossed every continent and every demographic boundary that typically limits access to elite education. High school students used it to prepare for university. Working professionals returned to it when switching careers. Educators in developing nations built curricula around materials that would otherwise cost more than their annual salaries.
Twenty-Five Years of Open Learning
The 25th Anniversary Symposium brought together MIT leadership, faculty, staff, OpenCourseWare learners and educators, and early and new funders of the program. Nearly 200 people gathered on campus to reflect on how a decision made in the early days of broadband internet had grown into something that touched half a billion lives.
MIT President Sally Kornbluth reflected on OpenCourseWare's global impact: "In 2001, MIT opened its doors to the world without requiring a key." The image is worth sitting with. A university one of the most prestigious in the world choosing to give away its core intellectual product. Not the diploma. Not the credential. The knowledge itself.
Elizabeth Siler, a professor at Worcester State University, discussed how she uses MIT's open educational resources in her own classroom, bridging the gap between institutions that might otherwise never intersect. A high school senior named Hinata Yamahara shared how OpenCourseWare helped fuel his curiosity and pass the FAA Private Pilot Knowledge Test. These stories are individual threads in a much larger tapestry one that now spans decades and continents.
The Long Game of Generosity
What makes Strang's contribution remarkable is not just the scale of the reach but the duration of the commitment. He didn't upload a single popular lecture as a marketing gesture. He maintained and updated his course materials for years, responding to changes in the field, refining explanations, and ensuring that what he offered remained current and useful. His dedication to clear explanation and open access transformed how mathematics is taught and learned worldwide.
His work continues to inspire educators and learners alike, proving that knowledge shared openly can have a lasting global impact. The decision to participate in OpenCourseWare was also, implicitly, a statement about what education is for. Is it a credential to be hoarded, a competitive advantage to be traded? Or is it something meant to be passed forward?
For Strang, the answer was never in question. He saw his role not as gatekeeping mathematics but as opening doors. Every lecture he recorded, every problem set he uploaded, every video he allowed to remain online was an act of faith in the next generation of learners people he would never meet, in places he would never visit, working on problems he could not imagine.
Other Voices in the Archive
Strang is not alone in this tradition of openness. At Trinity College Cambridge, Professor David Tong of Theoretical Physics has published lecture notes that have been downloaded more than five million times over twenty years of teaching. His materials cover everything from string theory to mathematical biology, spanning more than 4,000 pages of free content. In September 2025, he published four textbooks with Cambridge University Press Classical Mechanics, Electromagnetism, Quantum Mechanics, and Fluid Mechanics with the lecture notes remaining freely available online.
"You may wonder why you should buy the books when the lecture notes are freely available," Tong writes on his website. His answer: the books have more content, better explanations, and are sold at half the price of most other textbooks. Each cover features rare manuscripts from the Wren Library Ernest Rutherford's annotated copy of Newton's Principia on the Classical Mechanics cover, a James Clerk Maxwell watercolour painting on Electromagnetism. The gesture is both scholarly and symbolic: connecting modern students to the history of scientific discovery through physical artifacts.
The parallel with Strang is instructive. Both men understood that the lecture is not diminished by being shared. The student's understanding is not harmed by access. The professor's authority is not eroded by generosity. If anything, the opposite is true. A lecture that survives contact with the world that is tested by learners in different contexts, different cultures, different questions proves its own robustness.
What This Means for KnowledgePosts Readers
For readers researching practitioners, frameworks, and ideas in the education and learning space, the Strang story offers several concrete lessons. First, scale and generosity are not opposites. A professor teaching the same course for sixty years can simultaneously serve students in a physical classroom and millions online. The skills required are different, but the underlying commitment to clarity, to respect for the learner, to patient explanation remains constant.
Second, open educational resources represent a significant shift in how knowledge is valued and distributed. The traditional model where access to learning requires enrollment, tuition, and physical presence excludes enormous numbers of capable learners. OpenCourseWare and similar initiatives do not solve every access problem, but they remove at least one barrier: the financial cost of the materials themselves.
Third, the long tail of online education is real. A lecture posted in 2003 is still available in 2026. A student who discovers Strang's course today encounters the same care and clarity that students experienced in Cambridge decades ago. The medium changes; the substance remains.
Fourth, institutional support matters. Strang could not have made his lectures freely available without MIT's commitment to OpenCourseWare as an infrastructure. Individual faculty members may wish to share their knowledge openly, but they need organizational backing to do so sustainably. The OpenCourseWare model shows that institutions can bet on openness without betting against their own value.
The Library That Keeps Growing
There is something quietly radical about a professor who spends six decades refining a single course and then gives it away. In an era of subscription models, paywalls, and credentialing marketplaces, Strang's gesture stands out. He did not monetize his expertise. He did not create a premium tier for the full experience. He put everything online and trusted that the knowledge itself was enough.
His course is now among the most widely viewed university-level mathematics resources available online. The students who benefit most are often those who would never set foot in MIT's corridors the self-taught programmer in Nairobi, the curious high schooler in rural Mexico, the returning professional in Seoul who needs to understand the mathematics underneath the machine learning algorithms they are building. For these learners, Strang's chalkboard is not a gate but a door.
The bet that MIT made in 2001 "we will open our curriculum to the world without requiring a key" has paid off in ways that continue to compound. Every student who uses OpenCourseWare to learn linear algebra, to understand the mathematics behind AI, to prepare for a career that doesn't yet exist, is a return on that investment. The returns are not measured in dollars or degrees. They are measured in possibilities.
Where to Read Further
To explore Gilbert Strang's teaching legacy and the mathematics behind modern AI in more depth, start with BreezyScroll's detailed profile of his career, which traces how his pedagogical approach set his course apart from traditional mathematics instruction. The MIT News coverage of OpenCourseWare's 25th Anniversary Symposium offers institutional perspective on the decision to open MIT's curriculum and the global impact that decision has generated. For context on the broader culture of academic openness, the Trinity College Cambridge announcement about David Tong's lecture notes and textbooks demonstrates that Strang's approach to sharing knowledge freely is part of a larger tradition among distinguished educators.